Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Derivative Assets Offsetting Derivative Assets [Abstract] Due after three years through four years Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Four Reported Value Measurement Reported Value Measurement [Member] Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Schedule of Fair Value Measured on Non-Recurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Other financial assets Other Assets, Fair Value Disclosure Overdrawn demand deposit accounts Deposit Liabilities Reclassified as Loans Receivable, Percent Of Total Par Value Deposit Liabilities Reclassified as Loans Receivable, Percent Of Total Par Value Unrestricted Retained Earnings, Unappropriated [Member] Commitments to fund pension Fund Pension [Member] Fund Pension Employee Retirement Plans Retirement Benefits [Text Block] New transactions elected for fair value option Fair Value, Option, New Transactions Elected Fair Value, Option, New Transactions Elected Financial Instruments Subject to Mandatory Redemption [Roll Forward] Financial Instruments Subject to Mandatory Redemption [Roll Forward] Financial Instruments Subject to Mandatory Redemption Mandatorily redeemable capital stock (Note 14) Mandatorily redeemable capital stock Interest Expense, Capital Securities Derivative Instrument [Axis] Derivative Instrument [Axis] Measurement Frequency [Axis] Measurement Frequency [Axis] Held-to-maturity securities (Note 8) Interest Income, Debt Securities, Held-to-Maturity Fair value hedges Other Comprehensive Income (Loss), Fair Value Hedge, Gain (Loss), After Reclassification And Tax, Parent Other Comprehensive Income (Loss), Fair Value Hedge, Gain (Loss), After Reclassification And Tax, Parent Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Principal collected Proceeds from Principal Repayment, Loan and Lease, Held-for-Investment Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Mortgage-backed securities Total MBS Asset-Backed Securities [Member] Advances Federal Home Loan Bank, Advances [Text Block] Deposits Deposit Liabilities Disclosures [Text Block] Government-guaranteed or - insured mortgage loans Loans Insured or Guaranteed by US Government Authorities [Member] Postretirement Health Benefit Plan Postretirement Health Benefit Plan [Member] Postretirement Health Benefit Plan Thereafter Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Five Total unpaid principal balance Mortgage loans held for portfolio Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process Schedule of Risk-Based Capital Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Schedule of Major Security Types Debt Securities, Held-to-Maturity [Table Text Block] Related Party Transactions Related Party Transactions Disclosure [Text Block] Derivative contracts with financing element Payments for (Proceeds from) Hedge, Financing Activities Consolidated Obligation Bonds Fair Value Option Consolidated Obligation - Bonds, Fair Value Option [Member] Consolidated Obligation - Bonds, Fair Value Option Total, Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] Capital stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Cash and Cash Equivalents [Abstract] Retirement Benefits [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Thereafter Long-Term Debt, Maturity, After Year Five, Weighted Average Rate Long-Term Debt, Maturity, After Year Five, Weighted Average Rate Overdrawn demand deposit accounts Weighted Average Interest Rate on Overdrawn Demand Deposit Guardian Life Insurance Co. of America Guardian Life Insurance Company of America [Member] Guardian Life Insurance Company of America Schedule of Carrying Amount of FHLBNY’s Assets and Liabilities Schedule of Derivative Instruments [Table Text Block] Concentration Risk [Table] Concentration Risk [Table] Gain to be recognized to earnings within twelve months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Entity Address, City or Town Entity Address, City or Town Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Receivables [Abstract] Statement of Financial Position [Abstract] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Axis] Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Due after three years through four years Federal Home Loan Bank, Advances, Maturing in Rolling Year Four, Percent Of Total Par Value Federal Home Loan Bank, Advances, Maturing in Rolling Year Four, Percent Of Total Par Value Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Past due 90 days or more Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Revenue Benchmark Revenue Benchmark [Member] Total par value Par Advances Federal Home Loan Bank, Advances, Par Value Concentration Risk Type [Axis] Concentration Risk Type [Axis] Uncleared derivatives securities received as Variation Margin Security collateral received from counterparty Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] De-designated hedged assets, par value Hedged Asset, Fair Value Hedge, Par Value Hedged Asset, Fair Value Hedge, Par Value Net disbursements for grants and programs Voluntary Housing And Community Development Program, Payments For Voluntary Contributions Voluntary Housing And Community Development Program, Payments For Voluntary Contributions Advances, at fair value under the fair value option Federal Home Loan Bank, Advance, Fair Value, Option Federal Home Loan Bank, Advance, Fair Value, Option Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Total Consolidated obligations Federal Home Loan Bank, Consolidated Obligations Cleared derivatives Exchange Cleared [Member] Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Schedule of Remaining Maturities of Operating Leases Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Mortgage loans held-for-portfolio, allowance for credit losses Allowance for credit losses Allowance for credit losses on mortgage loans held for portfolio Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Capital stock subject to mandatory redemption reclassified from equity Financial Instruments Subject to Mandatory Redemption, Reclassifications Financial Instruments Subject to Mandatory Redemption, Reclassifications Document Period End Date Document Period End Date Annual lease receipt Lessor, Operating Lease, Annual Lease Receipt Lessor, Operating Lease, Annual Lease Receipt Year two Lessee, Operating Lease, Liability, to be Paid, Year Two Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Over two years through three years Long-Term Debt, Maturity, Year Three, Weighted Average Rate Long-Term Debt, Maturity, Year Three, Weighted Average Rate Total accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Interest-bearing demand Interest-bearing demand Interest-Bearing Domestic Deposit, Demand Advances (Note 9) (Includes $0 at September 30, 2026 and December 31, 2025 at fair value under the fair value option) Total Advances Federal Home Loan Bank, Advance Total capital Federal Home Loan Bank, Regulatory Capital, Actual Earnings Per Share of Capital Earnings Per Share [Text Block] Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Leverage capital Federal Home Loan Bank, Leverage Capital, Actual Available-for-sale securities, amortized cost of $12,937,180 at September 30, 2026 and $12,377,325 at December 31, 2025 (Note 7) Fair Value Estimated Fair Value Available-for-sale securities Debt Securities, Available-for-Sale, Excluding Accrued Interest Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Company Selected Measure Name Company Selected Measure Name Net unrealized gains (losses) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Hedging Basis Adjustments, Amortized Cost Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) Purchased Payments to Acquire Debt Securities, Available-for-Sale Concentration Risk [Line Items] Concentration Risk [Line Items] Due after one year through five years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Amortized Cost Equity Securities, FV-NI, Cost Operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Over four years through five years Long-Term Debt, Maturity, Year Five, Percentage Of Total Long-Term Debt, Maturity, Year Five, Percentage Of Total Over four years through five years Long-Term Debt, Maturity, Year Five, Weighted Average Rate Long-Term Debt, Maturity, Year Five, Weighted Average Rate Total deposits Deposits Deposits, Domestic Interest-bearing deposits Proceeds from (Payments for) in Interest-Bearing Deposits in Banks Non-Qualified Deferred Compensation Plan (DCP) Non-Qualified Deferred Compensation Plan [Member] Non-Qualified Deferred Compensation Plan Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Weighted Average Yield Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Rolling Year [Abstract] Financing Receivable, Credit Ratio [Table] Financing Receivable, Credit Ratio [Table] U.S. Treasury securities US Treasury Securities [Member] Held-to-maturity securities: Proceeds from Sale and Maturity of Held-to-Maturity Securities [Abstract] Affordable Housing Program payments Noncash, Affordable Housing Program Payments Noncash, Affordable Housing Program Payments Schedule of Roll Forward of Level 3 Available-For-Sale Securities Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Restricted Retained Earnings, Appropriated Operating cash flows - Cash Paid Operating Lease, Payments Hedged Consolidated obligation bonds Consolidated Obligation Bonds [Member] Consolidated Obligation Bonds Award Timing Predetermined Award Timing Predetermined [Flag] Valley National Bank Valley National Bank [Member] Valley National Bank Securities gains (losses) (Note 5 & Note 8) Net realized and unrealized (gains) losses on trading securities Debt Securities, Gain (Loss) Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Schedules of Concentration of Risk Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Hedge valuation basis adjustments Hedge valuation basis adjustments Federal Home Loan Bank, Consolidated Obligations, Bonds, Hedge Valuation Adjustments Federal Home Loan Bank, Consolidated Obligations, Bonds, Hedge Valuation Adjustments Consolidated obligation bonds: Proceeds from (Repayments of) Long-Term Debt and Capital Securities [Abstract] Total derivatives not designated as hedging instruments Derivative assets Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Proceeds from sales Proceeds from Sale, Debt Security, Trading, and Equity Security, FV-NI, Held-for-Investment Gains (losses) on hedged item in designated and qualifying fair value hedges: Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Repurchase/redemption of capital stock Stock Repurchased and Retired During Period, Value Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Premises, software, and equipment Depreciation Additional AHP contribution Voluntary Housing And Community Development Program, Voluntary Contribution Voluntary Housing And Community Development Program, Voluntary Contribution Due in one year or less Debt Securities, Held-To-Maturity, Amortized Cost Excluding Accrued Interest, Before Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, Year One Debt Securities, Held-To-Maturity, Amortized Cost Excluding Accrued Interest, Before Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, Year One Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] Operating lease right-of-use assets (Note 19) Right-of-use assets Operating Lease, Right-of-Use Asset Concentration Risk Type [Domain] Concentration Risk Type [Domain] Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Fair Value Disclosures [Abstract] Consolidated Obligation - Discount Notes, Fair Value Option Consolidated Obligation - Discount Notes, Fair Value Option [Member] Consolidated Obligation - Discount Notes, Fair Value Option Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Gains (losses) on derivatives in designated and qualifying fair value hedges: Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Trading Securities Available-for-Sale Securities Held-to-Maturity Securities Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Restricted Retained Earnings, Appropriated [Member] Cash dividends paid Payments of Ordinary Dividends, Common Stock Capital stock: Capital Stock [Abstract] Capital Stock Expiration Date Trading Arrangement Expiration Date Over three years through four years Long-Term Debt, Maturity, Year Four Gross Unrecognized Holding Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] Federal Home Loan Bank, Advances [Table] Federal Home Loan Bank, Advances [Table] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Proceeds from issuance of capital stock Proceeds from Issuance of Common Stock FVO - valuation adjustments and remaining accretion Hedge basis adjustments on de-designated hedges Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Fair Value Option, Valuation Adjustments And Accretion Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Fair Value Option, Valuation Adjustments And Accretion Deposits Deposits, Fair Value Disclosure Investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Related Party Transaction [Axis] Related Party Transaction [Axis] Interest rate swaps Interest Rate Swap [Member] Consolidated Obligations Debt Disclosure [Text Block] Deposits with other FHLBanks Increase (Decrease) in Deposits with Other Federal Home Loan Banks Interest paid for finance lease Noncash, Interest Paid For Finance Lease Noncash, Interest Paid For Finance Lease Over one year through two years Long-Term Debt, Maturity, Year Two, Percentage Of Total Long-Term Debt, Maturity, Year Two, Percentage Of Total PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Thereafter Long-Term Debt, Maturity, after Year Five Cash dividends on capital stock Dividends, Common Stock, Cash Total capital Beginning balance Ending balance Capital Equity, Attributable to Parent Federal funds sold (Note 4) Federal funds sold Federal funds sold Federal Funds Sold Assets Assets Assets [Abstract] Due in one year or less Federal Home Loan Bank, Advances, Maturing in Next 12 Rolling Months, Percent Of Total Par Value Federal Home Loan Bank, Advances, Maturing in Next 12 Rolling Months, Percent Of Total Par Value Schedule of Mortgage Loans and Impaired Loans Financing Receivable Credit Quality Indicators [Table Text Block] Mortgage loans held-for-portfolio (Note 10) Interest and Fee Income, Loans, Consumer, Real Estate Fair Value, Nonrecurring Fair Value, Nonrecurring [Member] Insider Trading Policies and Procedures [Line Items] Nonperforming Financial Instruments Nonperforming Financial Instruments [Member] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Consolidated obligations, net, discount notes at fair value under the fair value option Consolidated obligation, Discount notes Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Fair Value, Option Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Fair Value, Option Service fees and other Service Fees And Other Income Service Fees And Other Income Net change due to hedging activities Other Comprehensive Income (Loss), Hedge, Gain (Loss), After Reclassification And Tax, Parent [Abstract] Other Comprehensive Income (Loss), Hedge, Gain (Loss), After Reclassification And Tax, Parent Number of operating segments Number of Operating Segments Entity Central Index Key (CIK) Entity Central Index Key Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Advances Sold or Transferred Advances Sold Or Transferred [Member] Advances Sold Or Transferred Uncleared derivatives Over-the-Counter [Member] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Federal Home Loan Bank, Affordable Housing Program Obligation [Roll Forward] Federal Home Loan Bank, Affordable Housing Program Obligation [Roll Forward] State and local housing finance agency obligations State And Local Housing Finance Agency Obligations [Member] State And Local Housing Finance Agency Obligations Mortgage loan, amount funded Financing Receivable, Excluding Accrued Interest, Amount Funded Financing Receivable, Excluding Accrued Interest, Amount Funded Single-index floating rate Single-Index Floating Rate [Member] Single-Index Floating Rate Due in one year or less Debt Securities, Trading Securities, Maturity, Year One, Fair Value Debt Securities, Trading Securities, Maturity, Year One, Fair Value Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Carrying amount of hedged assets Hedged Asset, Fair Value Hedge Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Voluntary Contribution Federal Home Loan Bank, Affordable Housing Program Obligation, Voluntary Contribution Federal Home Loan Bank, Affordable Housing Program Obligation, Voluntary Contribution Schedule of Mandatorily Redeemable Capital Stock Mandatorily Redeemable Capital Stock [Table Text Block] Schedule of Rollforward Of Affordable Housing Program Liabilities Federal Home Loan Bank, Affordable Housing Program Obligation [Table Text Block] Hedge value basis adjustments Hedge value basis adjustments Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Hedge Valuation Basis Adjustments Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Hedge Valuation Basis Adjustments Statement [Line Items] Statement [Line Items] Total assets Assets Defined Benefit Plan [Table] Defined Benefit Plan [Table] Total interest expense Interest Expense, Operating Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Schedule of Changes in Voluntary Contribution Liability Schedule of Activity in Voluntary Contribution Liability [Table Text Block] Schedule of Activity in Voluntary Contribution Liability Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Discontinued Hedging Relationship Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Federal funds sold Increase (Decrease) in Federal Funds Sold Fixed medium-term single-family mortgages Fixed Medium Term Mortgage [Member] Fixed Medium Term Mortgage Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Affordable Housing Program liability Increase (Decrease) In Affordable Housing Program Liability Increase (Decrease) In Affordable Housing Program Liability PEO PEO [Member] Discount notes-amortized cost Amortized cost Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Amortized Cost Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Amortized Cost Over one year through two years Long-Term Debt, Maturity, Year Two Consolidated obligation bonds (Note 12) Interest Expense, Other Long-Term Debt Mortgage loans held-for-portfolio: Payments for (Proceeds from) Loans and Leases [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Due after four years through five years Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Five Thereafter Federal Home Loan Bank, Advances, Maturities Summary, after Rolling Year Five Equity investments gains (losses) (Note 6) Equity Securities, FV-NI, Gain (Loss) Goldman Sachs Bank USA Goldman Sachs Bank United States Of America [Member] Goldman Sachs Bank United States Of America Retained Earnings Retained Earnings [Member] Equity Investments Payments For (Proceeds From) Equity Securities, FV-NI Payments For (Proceeds From) Equity Securities, FV-NI Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Capital stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Estimated Fair Values Fair Value, by Balance Sheet Grouping [Table Text Block] Payments on bond transferred to other FHLBanks Payments for Bonds Transferred to Other Federal Home Loan Banks Total comprehensive income (loss) Comprehensive income (loss) Comprehensive Income (Loss), Net of Federal Home Loan Bank Assessments, Attributable to Parent Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Qualified Defined Benefit Plan (DB Plan) Qualified Defined Benefit Plan [Member] Qualified Defined Benefit Plan Lender Concentration Risk Lender Concentration Risk [Member] Mortgage delivery commitments Mortgage Delivery Commitments [Member] Mortgage Delivery Commitments Estimated Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] Schedule of Offsetting of Derivative Assets Offsetting Assets [Table Text Block] Affordable Housing Program Disclosure [Abstract] Affordable Housing Program Disclosure Total net amount of non-cash collateral received or repledged Derivative Asset, Subject to Master Netting Arrangement, Security Collateral Pledged, Net Derivative Asset, Subject to Master Netting Arrangement, Security Collateral Pledged, Net Housing and U.S. Obligations, Fixed Housing and U.S. Obligations, Fixed [Member] Housing and U.S. Obligations, Fixed Payments for maturing and early retirement Repayments of Other Long-Term Debt Advances: Proceeds (Payments) From Advances [Abstract] Proceeds (Payments) From Advances Purchases of mortgage loans, cumulative participations by other Federal Home Loan Banks Participating Mortgage Loans, Mortgage Obligations, Amount Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Par Advances Federal Home Loan Bank, Advances, Concentration Risk [Member] Federal Home Loan Bank, Advances, Concentration Risk Total capital-to-asset ratio Federal Home Loan Bank, Regulatory Capital Ratio, Actual Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Schedule of Summary of Deposits and Interest Rate Payment Terms Deposit Liabilities, Type [Table Text Block] Accrued interest payable Increase (Decrease) in Interest Payable, Net Schedule of Cash Flow Hedge Gains and Losses Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Total net exposure cash and non-cash Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction One year or less Long-Term Debt, Maturity, Year One, Weighted Average Rate Long-Term Debt, Maturity, Year One, Weighted Average Rate Total Fixed Asset-Backed Securities, Fixed, After Hedging Basis Adjustment [Member] Asset-Backed Securities, Fixed, After Hedging Basis Adjustment Collateralized Mortgage Obligations/Real Estate Mortgage Investment Conduits Collateralized Mortgage Obligations/Real Estate Mortgage Investment Conduits [Member] Collateralized Mortgage Obligations/Real Estate Mortgage Investment Conduits MBS AFS Before Hedging Adjustments Asset-Backed Securities, Before Hedging Adjustments [Member] Asset-Backed Securities, Before Hedging Adjustments Schedule of Consolidated Obligation Bonds Outstanding by Year of Maturity Schedule of Maturities of Long-Term Debt [Table Text Block] Schedule of Interest Rate Payment Terms For Investments Schedule Of Interest Rate Payment Terms For Investments [Table Text Block] Schedule Of Interest Rate Payment Terms For Investments Weighted Average Rate Long-Term Debt, Weighted Average Interest Rate, at Point in Time Total gains (losses) on derivatives in economic hedges Derivative, Gain (Loss) on Derivative, Net Manufacturers and Traders Trust Company Manufacturers and Traders Trust Company [Member] Manufacturers and Traders Trust Company Due after four years through five years Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Five Related Party Transaction [Domain] Related Party Transaction [Domain] Debt Assumptions Debt Assumptions [Member] Debt Assumptions Federal Home Loan Bank, Advances [Line Items] Federal Home Loan Bank, Advances [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost Thereafter Long-Term Debt, Maturity, After Year Five, Percentage Of Total Long-Term Debt, Maturity, After Year Five, Percentage Of Total Hedge basis adjustments on de-designated hedges Hedge basis adjustments on de-designated hedges Federal Home Loan Bank, Consolidated Obligations, Bonds, Hedge Basis Adjustments On De-Designated Hedges Federal Home Loan Bank, Consolidated Obligations, Bonds, Hedge Basis Adjustments On De-Designated Hedges Schedule of Allowance For Credit Losses And The Unpaid Principal Balances Financing Receivable, Allowance for Credit Loss [Table Text Block] Capital stock, issued (in shares) Common Stock, Shares, Issued Balance, beginning of the period Balance, end of the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 12 months or more, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Step Up, callable Step Up, Callable [Member] Step Up, Callable Other expenses Noninterest Expense [Abstract] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Hedged Consolidated obligation discount notes Consolidated Obligation Discount Notes [Member] Consolidated Obligation Discount Notes Affordable Housing Program and Voluntary Contributions Affordable Housing Program [Text Block] Year three Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Other Commitments [Axis] Other Commitments [Axis] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Uncleared derivatives Derivative assets Derivative Asset, Not Subject to Master Netting Arrangement Derivative Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Net exposure Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction MBS-GSE GSE/U.S. agency issued MBS US Government-sponsored Enterprises Debt Securities [Member] Fair Value as of Grant Date Award Grant Date Fair Value Schedule of Available-for-sale Securities with Estimated Fair Values Below their Amortized Cost Basis Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Transaction Market Method [Domain] Transaction Market Method [Domain] Operating Noninterest Operating Expense Noninterest Operating Expense Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Beginning balance Ending balance Voluntary Housing And Community Development Program, Voluntary Contribution Liability Voluntary Housing And Community Development Program, Voluntary Contribution Liability Arrangement Duration Trading Arrangement Duration Deposits (Note 11) Deposits Interest Expense, Domestic Deposits Entity Address, Postal Zip Code Entity Address, Postal Zip Code Registrant Name Entity Registrant Name Less than 12 months, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Required Federal Home Loan Bank, Requirements [Abstract] Federal Home Loan Bank, Requirements Cash collateral held and other borrowings Interest Expense, Other Interest income Interest Income, Operating [Abstract] Trading Securities, Debt Maturities, Next Rolling Maturity [Abstract] Trading Securities, Debt Maturities, Next Rolling Maturity [Abstract] Trading Securities, Debt Maturities, Next Rolling Maturity Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount CMO Collateralized Mortgage Obligations [Member] Voluntary contributions for ZPA Zero Percent Advance Program, Interest Rebates Zero Percent Advance Program, Interest Rebates Securities purchased under agreements to resell Proceeds from (Payments for) Securities Purchased under Agreements to Resell Schedule of MPF Mortgage Loans Held-for-portfolio by Collateral/Guarantee Type Financing Receivable, By Collateral Or Guarantee Type [Table Text Block] Financing Receivable, By Collateral Or Guarantee Type Schedule of Fair Values of Assets and Liabilities Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Hedge basis adjustments on de-designated hedges Hedge basis adjustments on de-designated hedges Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Hedge Basis Adjustments On De-Designated Hedges Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Hedge Basis Adjustments On De-Designated Hedges All Award Types Award Type [Domain] Fixed-rate, non-callable Fixed-Rate, Non-Callable [Member] Fixed-Rate, Non-Callable Remainder of fiscal year Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Fair Values of Financial Instruments Fair Value Disclosures [Text Block] Level 3 Level 3 Fair Value, Inputs, Level 3 [Member] MBS-Other U.S. Obligations US Government Agencies Debt Securities [Member] Operating lease term Lessee, Operating Lease, Term of Contract Interest-bearing Deposits, Federal Funds Sold and Securities Purchased Under Agreements to Resell Deposit Liabilities, Federal Funds Sold, Repurchase Agreements, Resale Agreements, Securities Borrowed, And Securities Loaned Disclosure [Text Block] Deposit Liabilities, Federal Funds Sold, Repurchase Agreements, Resale Agreements, Securities Borrowed, And Securities Loaned Disclosure Restricted cash balances Restricted Cash Held-to-maturity securities, allowance for credit losses Allowance for Credit Loss (ACL) Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Retirement Plan Name [Domain] Retirement Plan Name [Domain] Other assets Other Assets Carrying amount of hedged liabilities Hedged Liability, Fair Value Hedge Liability Class [Axis] Liability Class [Axis] Housing and U.S. Obligations, Floating Housing and U.S. Obligations, Floating [Member] Housing and U.S. Obligations, Floating Other income (loss) Noninterest Income [Abstract] Cash and due from banks at beginning of the period Cash and due from banks at end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Total par value (as a percent) Federal Home Loan Bank, Advances, Weighted Average Interest Rate Amount Federal Home Loan Bank, Advances, Par Value, Maturity, Rolling Year [Abstract] Non-NEOs Non-NEOs [Member] First loss account, amount Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, First Loss Account, Amount Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, First Loss Account, Amount Mortgage-backed securities acquired Payments to Acquire Mortgage-Backed Securities (MBS), Available-for-Sale Schedule of Consolidated Obligations Outstanding Schedule of Debt [Table Text Block] Unamortized discounts Financing Receivable, Unamortized Purchase Discount Financing Receivable, Unamortized Purchase Discount Customer [Domain] Customer [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] One year or less Long-Term Debt, Maturity, Year One Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Payments for repurchase/redemption of capital stock Payments for Repurchase of Common Stock Pools of Mortgages Collateralized Mortgage-Backed Securities [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Housing and U.S. obligations Housing and U.S. obligations Housing and U.S. Obligations [Member] Housing and U.S. Obligations Schedule of Gains and Losses on Economic Hedges Derivative Instruments, Gain (Loss) [Table Text Block] Award Type Award Type [Axis] Amounts Recorded in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Total capital-to-asset ratio Federal Home Loan Bank, Regulatory Capital Ratio, Required Federal Home Loan Bank, Regulatory Capital Ratio, Required Interest rate hedges Interest-rate derivatives Interest Rate Contract [Member] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Available-for-sale securities, amortized cost Amortized Cost Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Affordable Housing Program Assessments (Note 13) Additions from current period’s assessments Federal Home Loan Bank, Affordable Housing Program Obligation, Assessment Expense Total retained earnings Retained Earnings (Accumulated Deficit) Commitments to fund additional advances Fund Additional Advances [Member] Fund Additional Advances Equity Investments (Note 6) Fair Value Equity Investments Equity Securities, FV-NI Cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Securities sold under agreement to repurchase Interest Expense, Securities Sold under Agreements to Repurchase Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Capital Stock Class B Common Stock [Member] Thereafter Federal Home Loan Bank, Advances, Maturing After Rolling Year Five, Percent Of Total Par Value Federal Home Loan Bank, Advances, Maturing After Rolling Year Five, Percent Of Total Par Value Economic Hedge Not Designated as Hedging Instrument, Economic Hedge [Member] Derivative Contract [Domain] Derivative Contract [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Proceeds from sales Proceeds from Sale of Held-to-Maturity Securities Total liabilities and capital Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Liability in respect of member performance account for PFIs Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, Member Performance Account, Liability Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, Member Performance Account, Liability Schedule of Gains and Losses on Fair Value Hedges Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Trading securities (Note 5) (Includes $839,285 pledged as collateral at September 30, 2026 and $845,578 at December 31, 2025) Total trading securities Total Fair Value Trading securities Debt Securities, Trading Advance discounts Federal Home Loan Bank, Advances, Discount Tabular List, Table Tabular List [Table Text Block] Purchased Payments to Acquire Held-to-Maturity Securities Gross Unrealized Losses Equity Securities, FV-NI, Unrealized Loss Name Awards Close in Time to MNPI Disclosures, Individual Name Annualized accrual rates Financial Instruments Subject to Mandatory Redemption, Annualized Accrual Rate Financial Instruments Subject to Mandatory Redemption, Annualized Accrual Rate Carrying Value of AFS securities pledged collateral which can be repledged or resold Carrying Value Of Available For Sale Securities Pledged Collateral Carrying Value Of Available For Sale Securities Pledged Collateral Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Schedule of Major Security Types of Trading Securities Schedule of Carrying Value of Equity Investments Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Transfers of mortgage loans to real estate owned Real Estate Owned, Transfer to Real Estate Owned Actual Federal Home Loan Bank, Actual [Abstract] Federal Home Loan Bank, Actual Adjustment to Compensation: Adjustment to Compensation [Axis] Securities received as collateral Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Asset Over three years through four years Long-Term Debt, Maturity, Year Four, Weighted Average Rate Long-Term Debt, Maturity, Year Four, Weighted Average Rate Change in fair value adjustments on financial instruments held at fair value Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option Schedule of Employee Retirement Plan Expenses Schedule of Costs of Retirement Plans [Table Text Block] Credit Concentration Risk Credit Concentration Risk [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Hedging Designation [Axis] Hedging Designation [Axis] Total recurring fair value measurement - Assets Assets, Fair Value Disclosure Proceeds from sales of REO Proceeds from Sale of Foreclosed Assets Trading securities pledged as collateral Debt Securities, Trading, Restricted Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Purchased Payment for Acquisition, Loan, Held-for-Investment De-designated hedged liabilities, par value Hedged Liability, Discontinued Fair Value Hedge, Par Value Hedged Liability, Discontinued Fair Value Hedge, Par Value Gross amounts of netting adjustments and cash collateral Total netting adjustments and cash collateral Total netting adjustments and cash collateral Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Accrued interest receivable Accrued interest receivable Interest Receivable Name Trading Arrangement, Individual Name Trading securities: Payments to Acquire Investments [Abstract] Operating Lease Expense Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Due in one year or less Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Next 12 Rolling Months Change in fair value on Equity Investments Equity Securities, FV-NI, Unrealized Gain (Loss) Net premiums and discounts on Consolidated obligations, investments, mortgage loans and other adjustments Investment Income, Net, Amortization of Discount and Premium Cash and Due from Banks Cash and Cash Equivalents Disclosure [Text Block] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Over four years through five years Long-Term Debt, Maturity, Year Five Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Total other expenses Noninterest Expense Mortgage Partnership Finance Program Services Mortgage Partnership Finance Program Services [Member] Mortgage Partnership Finance Program Services Customer Concentration Risk Customer Concentration Risk [Member] Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash and due from banks Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Payments for maturing Repayments of Other Short-Term Debt Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Amortization of unrecognized net loss Defined Benefit Plan, Amortization of Gain (Loss) First loss account, percentage of loan Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, First Loss Account, Percentage Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, First Loss Account, Percentage Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Leverage capital Federal Home Loan Bank, Leverage Capital, Required Restatement Determination Date: Restatement Determination Date [Axis] Bond premiums Debt Instrument, Unamortized Premium Equitable Financial Life Insurance Co. Equitable Financial Life Insurance Company [Member] Equitable Financial Life Insurance Company Federal Home Loan Banks [Abstract] Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] Premises, software, and equipment Payments for (Proceeds from) Productive Assets Derivative assets due to accrued interest Increase (Decrease) in Derivative Assets Instruments held under the fair value option gains (losses) (Note 18) Net gains (losses) on financial instruments held under fair value option Fair Value, Option, Changes in Fair Value, Gain (Loss) U.S. Treasury notes U.S. Treasury notes US Treasury Notes Securities [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Net change in: Net Change In Investing Activities [Abstract] Net Change In Investing Activities Document Fiscal Year Focus Document Fiscal Year Focus Netting adjustments Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Top Ten Advance Holders Top Ten Advance Holders [Member] Top Ten Advance Holders Cash collateral and related accrued interest Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Customer [Axis] Customer [Axis] Capital stock issued Common Stock, Value, Issued Year one Lessee, Operating Lease, Liability, to be Paid, Year One Schedule of Types of Consolidated Obligation Bonds Issued and Outstanding by Interest Rate Payment Terms Schedule of Long-Term Debt Instruments [Table Text Block] Percentage of Total Financing Receivable, Excluding Accrued Interest, Before Allowance For Credit Loss, Fee, And Loan In Process, Percentage Financing Receivable, Excluding Accrued Interest, Before Allowance For Credit Loss, Fee, And Loan In Process, Percentage Schedule of Contractual Redemption Terms and Yields of Advances Federal Home Loan Bank, Advances [Table Text Block] Restatement Determination Date Restatement Determination Date Cash collateral and related accrued interest Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Due after one year through five years Debt Securities, Held-To-Maturity, Amortized Cost Excluding Accrued Interest, Before Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, After Year One Through Five Debt Securities, Held-To-Maturity, Amortized Cost Excluding Accrued Interest, Before Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, After Year One Through Five Other expenses Other Noninterest Expense Mortgage Loans Held-for-Portfolio Financing Receivables [Text Block] Amendment Flag Amendment Flag Interest paid for discount notes Interest Paid, Discount Notes Interest Paid, Discount Notes Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Schedule of FHLBNY’s Derivative Activities Based on Notional Amounts Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Payments on principal portion of finance lease obligation Finance Lease, Principal Payments Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Equity Investments Investment [Text Block] Standby letters of credit Standby Letters of Credit [Member] Citibank, N.A. Citibank National Association [Member] Citibank National Association U.S. Treasury bills US Treasury Bill Securities [Member] Interest expense Interest Expense, Operating [Abstract] Bonds (Includes $124,260 at September 30, 2026 and $556,866 at December 31, 2025 at fair value under the fair value option) Total Consolidated obligation bonds Bonds Federal Home Loan Bank, Consolidated Obligations, Bonds Accrued interest payable Financial Instruments Subject to Mandatory Redemption, Accrued Interest Payable Financial Instruments Subject to Mandatory Redemption, Accrued Interest Payable Advances Federal Home Loan Bank Advances [Member] Basis adjustment Financing Receivable, Basis Adjustments Financing Receivable, Basis Adjustments Consolidated obligations, net (Note 12) Federal Home Loan Bank, Consolidated Obligations [Abstract] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Assets Assets, Fair Value Disclosure [Abstract] Derivative Liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] Total interest rate contracts notionals Notional Amount of Derivatives Derivative, Notional Amount Average number of shares of capital used to calculate earnings per share (in shares) Weighted Average Number of Shares Outstanding, Basic Borrowing period from other FHLBanks Loans From Other Federal Home Loan Banks, Term Loans From Other Federal Home Loan Banks, Term Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Percentage of Total Federal Home Loan Bank Advances Percentage Of Total Par Value [Abstract] Federal Home Loan Bank Advances Percentage Of Total Par Value Year four Lessee, Operating Lease, Liability, to be Paid, Year Four Interest-bearing deposits (Note 4) Interest-bearing deposits Interest-bearing deposits Interest-Bearing Deposits in Banks and Other Financial Institutions Due after three years through four years Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four Due after five year through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Total other income (loss) Noninterest Income Due after ten years Debt Securities, Held-To-Maturity, Amortized Cost Excluding Accrued Interest, Before Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, After Year 10 Debt Securities, Held-To-Maturity, Amortized Cost Excluding Accrued Interest, Before Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, After Year 10 Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Federal funds sold (Note 4) Interest Income, Federal Funds Sold Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Thereafter Lessee, Operating Lease, Liability, to be Paid, Due After Year Four Lessee, Operating Lease, Liability, to be Paid, Due After Year Four Net income available to stockholders Net Income (Loss) Available to Common Stockholders, Basic Federal Home Loan Bank of Chicago Federal Home Loan Bank of Chicago [Member] Interest-bearing demand and overnight deposits as percentage of deposits Percentage of Interest-Bearing Domestic Deposits to Deposits Debt Securities, Held-to-Maturity [Table] Debt Securities, Held-to-Maturity [Table] Compensating balances Compensating Balance, Amount Receivable [Domain] Receivable [Domain] Held-to-maturity securities pledged as collateral Debt Securities, Held-to-Maturity, Restricted Mortgage loans held-for-portfolio, net of allowance for credit losses of $4,948 at September 30, 2026 and $3,691 at December 31, 2025 (Note 10) Total mortgage loans, carrying values net Total mortgage loans held-for-portfolio at carrying value Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Over three years through four years Long-Term Debt, Maturity, Year Four, Percentage Of Total Long-Term Debt, Maturity, Year Four, Percentage Of Total Depreciation and amortization: Depreciation, Depletion and Amortization [Abstract] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Redemption of mandatorily redeemable capital stock Financial Instruments Subject to Mandatory Redemption, Redemptions Financial Instruments Subject to Mandatory Redemption, Redemptions Weighted average shares of capital (in shares) Weighted Average Number of Shares Issued, Basic Concessions on Consolidated obligations Amortization of Debt Issuance Costs Voluntary Contribution Voluntary Housing And Community Development Program, Voluntary Contributions, Excluding Rebates Voluntary Housing And Community Development Program, Voluntary Contributions, Excluding Rebates Borrowings from other FHLBanks Loans from Other Federal Home Loan Banks Risk-based capital Federal Home Loan Bank, Risk-Based Capital, Required Carrying Value of HTM securities pledged collateral which can be repledged or resold Carrying Value Of Held To Maturity Securities Pledged Collateral Carrying Value Of Held To Maturity Securities Pledged Collateral Fair Value Option Activity [Roll Forward] Fair Value Option Activity [Roll Forward] Fair Value Option Activity Net change in: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Due in one year or less Federal Home Loan Bank, Advances, Maturities Summary, in Next Rolling 12 Months Due after five years through ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Capital and Mandatorily Redeemable Capital Stock Equity [Text Block] Gross amounts of netting adjustments and cash collateral Total netting adjustments and cash collateral Derivative liabilities, netting adjustment and cash collateral Derivative liabilities, netting adjustment and cash collateral Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Percentage of Total Long Term Debt Percentage Of Total Par Value Abstract [Abstract] Long Term Debt Percentage Of Total Par Value Abstract Transaction Market Method [Axis] Transaction Market Method [Axis] Amortized Cost Carrying Value Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Yield on trading securities due after one year through five years Debt Securities, Trading Securities, Maturity, Percentage Due After Year One Through Five Debt Securities, Trading Securities, Maturity, Percentage Due After Year One Through Five Total recurring fair value measurement - Liabilities Liabilities, Fair Value Disclosure 12 months or more, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Statement of Comprehensive Income [Abstract] Finance lease right-of-use asset (Note 19) Finance lease right-of-use asset Finance Lease, Right-of-Use Asset, after Accumulated Amortization Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] New York Life Insurance Company New York Life Insurance Company [Member] New York Life Insurance Company Unamortized premiums Financing Receivable, Unamortized Purchase Premium Financing Receivable, Unamortized Purchase Premium Net income Net Income Net income Net Income (Loss) Attributable to Parent, Net of Federal Home Loan Bank Assessments Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Consolidated obligation discount notes: Proceeds from (Repayments of) Debt [Abstract] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Deposits and other borrowings Increase (Decrease) in Deposits and Other Borrowings Increase (Decrease) in Deposits and Other Borrowings Litigation settlement Gain (Loss) from Litigation Settlement Total retirement plan expenses Pension and Other Postretirement Benefits Cost (Reversal of Cost) Net change in: Net Change In Financing Activities [Abstract] Net Change In Financing Activities Overnight loans extended to other FHLBanks Loans to Other Federal Home Loan Banks Due in one year or less Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Consolidated obligation discount notes (Note 12) Interest Expense, Other Short-Term Borrowings Change in net fair value adjustments on derivatives and hedging activities Unrealized Gain (Loss) on Derivatives Total par value Total par value Long-Term Debt, Gross Yield on trading securities due in one year or less Debt Securities, Trading Securities, Maturity, Percentage Due Year One Debt Securities, Trading Securities, Maturity, Percentage Due Year One Asset Class [Domain] Asset Class [Domain] Due after one year through two years Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Two Related Party Transactions [Abstract] Metropolitan Tower Life Insurance Company Metropolitan Tower Life Insurance Company [Member] Metropolitan Tower Life Insurance Company Finance Agency and Office of Finance Finance Agency And Office Of Finance Expense Finance Agency And Office Of Finance Expense Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Related Party Transaction [Line Items] Related Party Transaction [Line Items] Total mortgage loans amortized cost Total mortgage loans amortized cost Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Underlying Security Market Price Change Underlying Security Market Price Change, Percent Security collateral pledged as initial margin to Derivative Clearing Organization Security collateral pledged as initial margin to Derivative Clearing Organization Derivative Asset, Subject to Master Netting Arrangement, Security Collateral Pledged Derivative Asset, Subject to Master Netting Arrangement, Security Collateral Pledged Derivatives and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Gross Unrecognized Holding Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Schedule of Carrying Value and Fair Value of Short-Term Investments Schedule of Carrying Value and Fair Value of Short-Term Investments [Table Text Block] Schedule of Carrying Value and Fair Value of Short-Term Investments Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Par value Short-Term Debt Gross recognized amount Derivative Liability, Subject to Master Netting Arrangement, before Offset Principal collected Proceeds from FHLBank Advance, Investing Activities Debt Securities, Available-for-Sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Open delivery commitments (MAP) Open Delivery Commitments [Member] Open Delivery Commitments Total net amounts after offsetting adjustments and cash collateral Derivative Liability, Subject to Master Netting Arrangement, after Offset Purchased Payment for Acquisition, Trading Security, Held-for-Investment Total undiscounted lease payments Lessee, Operating Lease, Liability, to be Paid Transfers and Servicing [Abstract] Schedule of Fair Value Option Disclosures Fair Value Option, Disclosures [Table Text Block] All Executive Categories All Executive Categories [Member] Voluntary Contributions (Note 13) Aggregate Voluntary And Supplemental Contributions Aggregate Voluntary And Supplemental Contributions Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Other Comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Schedule of Components of Net Periodic Cost Schedule of Net Benefit Costs [Table Text Block] Fixed long-term single-family mortgages Fixed Long Term Mortgage [Member] Fixed Long Term Mortgage Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Percentage of Total Long-Term Debt, Maturity, Percentage Of Total Long-Term Debt, Maturity, Percentage Of Total Accounting Changes and Error Corrections [Abstract] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Repayments Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Total derivatives before netting and collateral adjustments Derivative liabilities Derivative liabilities Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Liabilities Liabilities [Abstract] Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Overdrawn demand deposit accounts Deposit Liabilities Reclassified as Loans Receivable Other liabilities Other Liabilities Net periodic benefit cost - Defined Benefit component Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Issued, guaranteed or insured: Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Fixed income funds Fixed Income Funds [Member] Mortgage Loans On Real Estate Held For Portfolio [Table] Financing Receivable, Allowance for Credit Loss [Table] Hedging Basis Adjustments, Gross Unrealized Gains Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Accumulated Gross Unrealized Gains, Before Tax, Cumulative Increase (Decrease) Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Accumulated Gross Unrealized Gains, Before Tax, Cumulative Increase (Decrease) Segment Information and Concentration Concentration Risk Disclosure [Text Block] Schedule of Held-to-Maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Total net change due to hedging activities Other Comprehensive Income (Loss), Hedge, Gain (Loss), After Reclassification And Tax, Parent Other Comprehensive Income (Loss), Hedge, Gain (Loss), After Reclassification And Tax, Parent Held-to-maturity securities, net of allowance for credit losses of $86 at September 30, 2026 and $76 at December 31, 2025 (Note 8) (Includes $0 pledged as collateral at September 30, 2026 and December 31, 2025) Carrying Value Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Fair Value, Recurring Fair Value, Recurring [Member] Due after two years through three years Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Three Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Accrued interest payable Interest Payable Conventional mortgage loans Conventional Mortgage Loan [Member] Mandatorily redeemable capital stock (Note 14) Beginning balance Ending balance Mandatorily redeemable capital stock Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount One year or less Long-Term Debt, Maturity, Year One, Percentage Of Total Long-Term Debt, Maturity, Year One, Percentage Of Total Unrestricted Retained Earnings, Unappropriated Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] Mortgage loans held-for-portfolio, net Mortgage loans held-for-portfolio Loans Receivable, Fair Value Disclosure Adoption Date Trading Arrangement Adoption Date Metropolitan Life Insurance Company Metropolitan Life Insurance Company [Member] Metropolitan Life Insurance Company Teachers Ins. and Annuity Assoc of America Teachers Ins. And Annuity Assoc Of America [Member] Teachers Ins. And Annuity Assoc Of America Counterparty Name [Domain] Counterparty Name [Domain] Net unamortized discounts Debt Securities, Held-To-Maturity, Unamortized Discount (Premium), Net Debt Securities, Held-To-Maturity, Unamortized Discount (Premium), Net Consolidated obligation bonds-amortized cost Federal Home Loan Bank, Consolidated Obligations, Bonds, Amortized Cost Federal Home Loan Bank, Consolidated Obligations, Bonds, Amortized Cost Proceeds from issuance Proceeds from Other Short-Term Debt Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Operating lease liabilities (Note 19) Lease Liabilities Total operating lease liabilities Operating Lease, Liability Fair Value Estimated Fair Value Held-to-maturity securities Debt Securities, Held-to-Maturity, Fair Value Finance lease liabilities (Note 19) Finance lease liability Finance Lease, Liability Total interest income Interest Income, Operating Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Step Down, callable Step Down, Callable [Member] Step Down, Callable Due after one year through two years Federal Home Loan Bank, Advances, Maturing in Rolling Year Two, Percent Of Total Par Value Federal Home Loan Bank, Advances, Maturing in Rolling Year Two, Percent Of Total Par Value OTTI Recognized in AOCI Other Comprehensive Income (Loss), Other Than Temporary Impairment, Held To Maturity Debt Securities, Net Of Tax Other Comprehensive Income (Loss), Other Than Temporary Impairment, Held To Maturity Debt Securities, Net Of Tax Payments on discount notes transferred to other FHLBanks Payments On Discount Notes Transferred To Other Federal Home Loan Banks Payments On Discount Notes Transferred To Other Federal Home Loan Banks Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Capital stock subject to mandatory redemption reclassified from equity Capital Stock Subject To Mandatory Redemption Reclassified From Equity Capital Stock Subject To Mandatory Redemption Reclassified From Equity Due after four years through five years Federal Home Loan Bank, Advances, Maturing in Rolling Year Five, Percent Of Total Par Value Federal Home Loan Bank, Advances, Maturing in Rolling Year Five, Percent Of Total Par Value Securities purchased under agreements to resell (Note 4) Interest Income, Securities Purchased under Agreements to Resell All Adjustments to Compensation All Adjustments to Compensation [Member] Non-interest-bearing demand Non-interest-bearing demand Noninterest-Bearing Domestic Deposit, Demand Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Derivative liabilities due to accrued interest Increase (Decrease) in Derivative Liabilities Financing Receivable, Credit Ratio [Line Items] Financing Receivable, Credit Ratio [Line Items] Income Statement [Abstract] Capital (Note 14) Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Due after one year through five years Debt Securities, Trading Securities, Maturity, After Year One Through Five, Fair Value Debt Securities, Trading Securities, Maturity, After Year One Through Five, Fair Value Other Commitments [Domain] Other Commitments [Domain] City Area Code City Area Code Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Amortization of unrecognized past service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Net change in pension and postretirement benefits Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Advances, Fair Value Option Advances, Fair Value Option [Member] Advances, Fair Value Option Shares reclassified to mandatorily redeemable capital stock (in shares) Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Shares Fixed-rate, callable Fixed-Rate, Callable [Member] Fixed-Rate, Callable Other assets Increase (Decrease) in Other Operating Assets Proceeds from issuance of capital stock (in shares) Stock Issued During Period, Shares, New Issues 30 days or more past due Financial Asset, Equal To Or Greater Than 30 Days Past Due [Member] Financial Asset, Equal To Or Greater Than 30 Days Past Due Measurement Basis [Axis] Measurement Basis [Axis] Netting adjustments Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Repurchase/redemption of capital stock (in shares) Stock Repurchased and Retired During Period, Shares Cash equivalents Cash Equivalents [Member] Made Payments for FHLBank Advance, Investing Activities Due after two years through three years Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Affordable Housing Program (Note 13) Beginning balance Ending balance Affordable Housing Program Federal Home Loan Bank, Affordable Housing Program Obligation Flagstar Bank, N.A. Flagstar Bank, National Association [Member] Flagstar Bank, National Association Schedule of Operating Lease Assets and Liabilities Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Liabilities Liabilities, Fair Value Disclosure [Abstract] Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Over two years through three years Long-Term Debt, Maturity, Year Three Financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Premises, software, and equipment Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Interest cost Defined Benefit Plan, Interest Cost Financial Instruments [Domain] Financial Instruments [Domain] Voluntary Contribution Liability [Roll Forward] Voluntary Contribution Liability [Roll Forward] Voluntary Contribution Liability Derivative assets (Note 17) Total derivative assets and total derivative liabilities presented in the Statements of Condition Total derivative assets and total derivative liabilities Derivative Asset Balance, beginning of the period Balance, end of the period Fair Value, Option, Fair Value Carrying Amount, Liabilities Fair Value, Option, Fair Value Carrying Amount, Liabilities CMBS Commercial Mortgage Backed Securities Before Hedging Adjustments [Member] Commercial Mortgage Backed Securities Before Hedging Adjustments Underlying Securities Award Underlying Securities Amount Estimate of Fair Value Measurement Estimate of Fair Value Measurement [Member] Proceeds from issuance of capital stock Stock Issued During Period, Value, New Issues Due after five years through ten years Debt Securities, Held-To-Maturity, Amortized Cost Excluding Accrued Interest, Before Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, After Year 5 Through 10 Debt Securities, Held-To-Maturity, Amortized Cost Excluding Accrued Interest, Before Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, After Year 5 Through 10 Pass-through Pass Thru Mortgage-Backed Securities [Member] Pass Thru Mortgage-Backed Securities Weighted Average Discount Rate Operating Lease, Weighted Average Discount Rate, Percent Risk-based capital Federal Home Loan Bank, Risk-Based Capital, Actual Insurance Companies Insurance Companies [Member] Insurance Companies Related Party Transaction [Table] Related Party Transaction [Table] Provision (Reversal) for credit losses Provision (Reversal) for credit losses Provision for Loan, Lease, and Other Losses Computer Equipment Computer Equipment [Member] Schedule of Lease Cost Lease, Cost [Table Text Block] Schedule of Major Security Types Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Less than 12 months, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Deposits (Note 11) Deposits Liabilities, Balance Sheet, Reported Amounts [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Uncleared derivatives Derivative liabilities Derivative Liability, Not Subject to Master Netting Arrangement Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount MetLife, Inc.: MetLife, Inc. [Member] MetLife, Inc. Derivative [Line Items] Derivative [Line Items] Shares reclassified to mandatorily redeemable capital stock Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Cash dividends on capital stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Schedule of Redemption Terms of the Major Types of Trading Securities Schedule of Amortized Cost and Estimated Fair Value of Investments by Contractual Maturity Schedule of Amortized Cost and Estimated Fair Value of Investments by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Amounts Reclassified From AOCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Leverage ratio Federal Home Loan Bank, Leverage Ratio, Required Federal Home Loan Bank, Leverage Ratio, Required Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Net unrealized fair value losses Debt Securities, Trading, Unrealized Loss Gross Unrealized Gains Equity Securities, FV-NI, Unrealized Gain Finance lease term Lessee, Finance Lease, Term of Contract Percentage of standard credit enhancement, loan funded Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, Accrued Credit Enhancement Fees, Percentage Of Loan Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest, Accrued Credit Enhancement Fees, Percentage Of Loan Net disbursements for grants and programs Payment for Affordable Housing Program Obligation by Federal Home Loan Bank Total adjustments Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity Equity Components [Axis] Equity Components [Axis] Related Party Related Party [Member] Entity Interactive Data Current Entity Interactive Data Current Available-for-Sale Securities Available-for-Sale Securities [Member] Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Entity Small Business Entity Small Business Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Discontinued Hedging Relationship Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Bond discounts Debt Instrument, Unamortized Discount Weighted Average Rate Long Term Debt By Maturity Weighted Average Interest Rate [Abstract] Long Term Debt By Maturity Weighted Average Interest Rate Net interest income before provision for credit losses Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Net amounts after offsetting adjustments and cash collateral Derivative Asset, Subject to Master Netting Arrangement, after Offset Document Type Document Type Due after ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Consolidated obligation bonds/discount notes traded not settled Consolidated Obligation Bonds And Discount Notes Traded, Not Settled [Member] Consolidated Obligation Bonds And Discount Notes Traded, Not Settled Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Gains (losses) from extinguishment of debt Losses (gains) from extinguishment of debt Gain (Loss) on Extinguishment of Debt Interest Income Federal Home Loan Bank, Advances, Interest Income, Concentration Risk [Member] Interest Income Federal Home Loan Bank Advances Top Ten Advance Holders Allowance for credit losses on AFS securities Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Available-for-sale securities: Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Local Phone Number Local Phone Number Advances, net (Note 9) Advances Interest Income Interest Income, Federal Home Loan Bank Advances Income before assessments Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Commitments and Contingencies (Notes 14, 17 and 19) Commitments and Contingencies ESL Federal Credit Union ESL Federal Credit Union [Member] ESL Federal Credit Union Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Executive Category: Executive Category [Axis] Receivable Type [Axis] Receivable Type [Axis] Floating rate, callable Floating Rate, Callable [Member] Floating Rate, Callable Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and capital Liabilities and capital Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] Over two years through three years Long-Term Debt, Maturity, Year Three, Percentage Of Total Long-Term Debt, Maturity, Year Three, Percentage Of Total Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Supplemental disclosures: Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Debt Transfers Debt Transfers [Member] Debt Transfers Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Mortgage Asset Programs Mortgage Asset Programs [Member] Mortgage Asset Programs Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Cash and due from banks (Note 3) Cash and due from banks Cash and Due from Banks Other Commitments [Line Items] Other Commitments [Line Items] Maturities and terminations Fair Value, Option, Maturities and Terminations Fair Value, Option, Maturities and Terminations Total Floating Asset-Backed Securities, Floating [Member] Asset-Backed Securities, Floating Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] FVO - valuation adjustments and accrued interest FVO - valuation adjustments and accrued interest Federal Home Loan Bank, Consolidated Obligations, Bonds, Fair Value Option, Valuation Adjustments And Accrued Interest Federal Home Loan Bank, Consolidated Obligations, Bonds, Fair Value Option, Valuation Adjustments And Accrued Interest Measurement Frequency [Domain] Measurement Frequency [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Compensation and benefits Labor and Related Expense Consolidated obligations, net, at fair value under the fair value option Consolidated obligation, Bonds Federal Home Loan Bank, Consolidated Obligations, Bonds, Fair Value, Option Federal Home Loan Bank, Consolidated Obligations, Bonds, Fair Value, Option Amount of transaction Related Party Transaction, Amounts of Transaction Repayments Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Schedule of Notional Balances and Estimated Fair Values of the Derivatives Outstanding Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Basic earnings per share (in dollars per share) Basic earnings per share (in dollars per share) Earnings Per Share, Basic Insider Trading Arrangements [Line Items] Change in accrued interest/unaccreted balance Fair Value, Option, Change In Accrued Interest And Unaccreted Balance Fair Value, Option, Change In Accrued Interest And Unaccreted Balance Operating Leases Assets and Liabilities, Lessee [Abstract] Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Liabilities - Active Hedging Relationship Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Net change in unrealized gains (losses) on available-for-sale securities Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Schedule of Outstanding Consolidated Obligation Discount Notes Schedule of Short-Term Debt [Table Text Block] Less: Mandatorily redeemable capital stock (in shares) Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Proceeds from issuance Proceeds from Issuance of Other Long-Term Debt Weighted average interest rate (as a percent) Short-Term Debt, Weighted Average Interest Rate, at Point in Time Concentration risk percentage Concentration Risk, Percentage Equity Awards Adjustments Equity Awards Adjustments [Member] Yield on trading securities Debt Securities, Trading Securities, Maturity, Percentage Debt Securities, Trading Securities, Maturity, Percentage Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Other liabilities Increase (Decrease) in Other Operating Liabilities Schedule of Information on Mortgage Loans Held-for-portfolio Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Mortgage Partnership Finance Mortgage Partnership Finance [Member] Mortgage Partnership Finance Cumulative Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Items Gains (Losses) - Assets - Active Hedging Relationship Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Total capital Federal Home Loan Bank, Regulatory Capital, Required Asset-Backed Securities, Fixed Asset-Backed Securities, Fixed [Member] Asset-Backed Securities, Fixed Leverage ratio Federal Home Loan Bank, Leverage Ratio, Actual CMBS Commercial Mortgage-Backed Securities [Member] Hedging Designation [Domain] Hedging Designation [Domain] Statement of Cash Flows [Abstract] Prudential Insurance Company of America The Prudential Insurance Company Of America [Member] The Prudential Insurance Company Of America Total off-balance sheet commitments Other Commitment Qualified Defined Contribution Plan (DC Plan) Qualified Defined Contribution Plan [Member] Qualified Defined Contribution Plan Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Available-for-sale securities (Note 7) Interest Income, Debt Securities, Available-for-Sale, Operating Real estate owned Real Estate Acquired Through Foreclosure Year five Lessee, Operating Lease, Liability, to be Paid, Year Five Trading securities (Note 5) Interest Income, Debt Securities, Trading, Operating Securities purchased under agreements to resell (Note 4) Securities purchased under agreements to resell Securities purchased under agreements to resell Securities Purchased under Agreements to Resell Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total Change in OCI for Period Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Over one year through two years Long-Term Debt, Maturity, Year Two, Weighted Average Rate Long-Term Debt, Maturity, Year Two, Weighted Average Rate Entity Filer Category Entity Filer Category Total, Estimated Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Total short-term investments Short-Term Investments Schedule of Offsetting of Derivative Liabilities Offsetting Liabilities [Table Text Block] Total par value (as a percent) Federal Home Loan Bank, Advances, Percent Of Total Par Value Federal Home Loan Bank, Advances, Percent Of Total Par Value Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Rolling Maturity [Abstract] Amount Long-Term Debt, Fiscal Year Maturity [Abstract] Derivative gains (losses) (Note 17) Gain (Loss) on Derivative Instruments, Net, Pretax Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Deposits [Abstract] Investments, Debt and Equity Securities [Abstract] Due after two years through three years Federal Home Loan Bank, Advances, Maturing in Rolling Year Three, Percent Of Total Par Value Federal Home Loan Bank, Advances, Maturing in Rolling Year Three, Percent Of Total Par Value Hedge valuation basis adjustments Federal Home Loan Bank, Advances, Valuation Adjustments for Hedging Activities Net Income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Loans to other FHLBanks (Note 20) Loans to other FHLBanks Interest Income, Loans to Other Federal Home Loan Banks Net unamortized (premium) / discounts Debt Securities, Available-For-Sale, Unamortized Discount (Premium), Net Debt Securities, Available-For-Sale, Unamortized Discount (Premium), Net Interest rate caps Interest Rate Cap [Member] Non-Qualified Deferred Incentive Compensation - Defined Contribution component Defined Contribution Plan, Cost, Net Defined Contribution Plan, Cost, Net Derivative liabilities (Note 17) Total derivative assets and total derivative liabilities presented in the Statements of Condition Total derivative assets and total derivative liabilities Derivative Liability Carrying Value of Trading securities pledged collateral which can be repledged or resold Carrying Value Of Trading Securities Pledged Collateral Carrying Value Of Trading Securities Pledged Collateral Entity Address, Address Line One Entity Address, Address Line One One member One Member [Member] One Member Permanent capital weighting factor Federal Housing Finance Agency, Permanent Capital Weighting Factor Federal Housing Finance Agency, Permanent Capital Weighting Factor Estimated Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Risks and Uncertainties [Abstract] Due after one year through two years Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Equity funds Equity Funds [Member] Derivative Liabilities Offsetting Derivative Liabilities [Abstract] Schedule of Off-Balance Sheet Commitments and Contingencies Schedule Of Off-Balance Sheet Commitments And Contingencies [Table Text Block] Schedule Of Off-Balance Sheet Commitments And Contingencies Financial Accounting Standards Board (FASB) Standards Issued Accounting Standards Update and Change in Accounting Principle [Text Block] Statement [Table] Statement [Table] Percentage of Total Long-Term Debt, Percentage Of Total Long-Term Debt, Percentage Of Total Interest-bearing deposits (Note 4) Interest-bearing deposits Interest Income, Domestic Deposits Redemption of mandatorily redeemable capital stock Repayments of Mandatory Redeemable Capital Securities Gross recognized amount Derivative Asset, Subject to Master Netting Arrangement, before Offset Net change in non-credit portion on held-to-maturity securities Other Comprehensive Income (Loss), Held-To-Maturity Securities Adjustment, Net Of Tax, Portion Attributable To Parent Other Comprehensive Income (Loss), Held-To-Maturity Securities Adjustment, Net Of Tax, Portion Attributable To Parent Discount notes (Includes $0 at September 30, 2026 and $577,958 at December 31, 2025 at fair value under the fair value option) Total Consolidated obligation discount notes Discount notes Federal Home Loan Bank, Consolidated Obligations, Discount Notes Pass-through reserves of member institutions deposited with Federal Reserve Banks Cash Pass-through Reserve, Federal Home Loan Bank Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]