Other commitments Commitments, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] After 3 years through 4 years Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Four Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Carrying Value(1) Reported Value Measurement [Member] Subsequent Event Subsequent Event [Member] Western Alliance Bank Western Alliance Bank [Member] Western Alliance Bank Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Federal Housing Finance Agency Regulator Expenses, Cost Assessed on Federal Home Loan Bank Document Fiscal Year Focus Document Fiscal Year Focus Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Cash collateral posted, including accrued interest Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Mortgage loans on nonaccrual status, with no allowance Financing Receivable, Nonaccrual, No Allowance Financial Instrument [Axis] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Financial Instrument [Axis] Net proceeds from issuance of consolidated obligations: Proceeds from Issuance of Long-Term Debt [Abstract] Other assets Other Assets, Fair Value Disclosure Customer [Axis] Customer [Axis] Unrestricted Retained Earnings Retained Earnings, Unappropriated [Member] Leverage ratio - Required Leverage Ratio, Required Leverage ratio requirement as defined in the regulations. After 5 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, after Rolling Year Five Net interest settlements Net Interest Settlements [Member] Net settlements of Economic Hedges Depreciation and amortization/(accretion) Depreciation, Amortization and Accretion, Net Debt Instrument Option Feature [Domain] Federal Home Loan Bank, Consolidated Obligation Option Feature [Domain] Provides general categories of debt call features for which information is required or determined to be disclosed. Federal Home Loan Bank, Advances Federal Home Loan Bank, Advances [Table Text Block] Cash collateral received, including accrued interest Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Mandatorily redeemable capital stock Interest Expense, Capital Securities Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] HTM securities Interest Income, Debt Securities, Held-to-Maturity Mortgage Loans Held for Portfolio Financing Receivables [Text Block] Amendment Flag Amendment Flag Conversion of Class B Stock (Shares) Conversion of Stock, Shares Converted Common Stock, Shares, Outstanding Entity Common Stock, Shares Outstanding Principal collected Proceeds from Principal Repayment, Loan and Lease, Held-for-Investment Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Standby letters of credit outstanding Standby Letters of Credit [Member] Advances Federal Home Loan Bank, Advances [Text Block] Interest Expense: Interest Expense, Operating [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Investments [Domain] Investments [Domain] Bonds Total CO Bonds Federal Home Loan Bank, Consolidated Obligations, Bonds Deposits Deposit Liabilities Disclosures [Text Block] After 5 years Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Five Non-callable Non Callable [Member] A debt obligation not collateralized by pledge, mortgage or other lien in the entity's assets and is neither callable or putable. Unpaid principal balance Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Consolidated obligations: Federal Home Loan Bank, Consolidated Obligations [Abstract] HTM (Amortized Cost & Fair Values) Debt Securities, Held-to-Maturity [Table Text Block] Transactions with Certain Members, Certain Nonmembers, and Other FHLBanks Related Party Transactions Disclosure [Text Block] Net proceeds/(payments) on derivative contracts with financing elements Payments for (Proceeds from) Hedge, Financing Activities Entity Address, State or Province Entity Address, State or Province Unrealized Losses: Total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Capital stock, par value Common Stock, Par or Stated Value Per Share Assets Assets, Fair Value Disclosure [Abstract] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Derivatives, Notional Amount Derivative, Notional Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Loss Contingencies [Line Items] Loss Contingencies [Line Items] After 4 years through 5 years Long-Term Debt, Maturities, Repayments of Principal in Rolling Year Five Interest-bearing deposits Interest-Bearing Deposits in Banks and Other Financial Institutions Fair Value Option, Principal Balance, CO Bonds Fair Value Option, Principal Balance, Consolidated Obligation Bonds Represents the outstanding amount of the unpaid principal balance of consolidated obligation bonds for which the fair value option has been elected. Earlier of Contractual Maturity or Next Call Date [Member] Earlier of Contractual Maturity or Next Call Date [Member] Long-term debt by maturity type, using earlier of contractual maturity or next call date. After 3 years through 4 years Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four Fair Value: Due Year 5-10 Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Total Other Income/(Loss) Noninterest Income Concentration Risk [Table] Concentration Risk [Table] Amortized Cost: Total Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Entity Address, City or Town Entity Address, City or Town Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Receivables [Abstract] Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Debt Instrument Option Feature [Axis] Federal Home Loan Bank, Consolidated Obligation Option Feature [Axis] Information about specific consolidated obligations option features reported by the Federal Home Loan Bank. Federal funds sold Interest Income, Federal Funds Sold Class of Stock [Axis] Class of Stock [Axis] Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-Maturity [Table] Level 2 Fair Value, Inputs, Level 2 [Member] Equal to or Greater than 90 Days Past Due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Other Additional Fair Value Elements [Abstract] Dividends [Domain] Dividends [Domain] Federal Home Loan Bank, Advances, by Interest Rate Type [Abstract] Federal Home Loan Bank, Advances, Par Value, by Interest Rate Type [Abstract] Total par value Federal Home Loan Bank, Advance, Branch of FHLBank, Amount Federal Home Loan Bank, Advances, Par Value Net transfers of shares between class B-1 and class B-2 (in shares) Net Transfers Of Shares Between Class B-1 And Class B-2, Shares Net Transfers Of Shares Between Class B-1 And Class B-2, Shares Subsequent Event Type [Axis] Subsequent Event Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Mortgage loans held for portfolio, net of allowance for credit losses Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Transactions with Certain Members and Nonmembers Transactions with Certain Members and Nonmembers [Table Text Block] Transactions with members that have an officer or director serving on the Bank’s Board of Directors, by balance sheet and income statement grouping. Use of Estimates Use of Estimates, Policy [Policy Text Block] Related Party [Axis] Related and Nonrelated Parties [Axis] Consolidated obligation bonds Bonds Unsecured Debt [Member] Total consolidated obligations Federal Home Loan Bank, Consolidated Obligations Cleared derivatives Exchange Cleared [Member] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Interest Income from Advances Interest Income, Net of Interest Effect of Derivatives, Federal Home Loan Bank Advances Interest income, net of interest effect of derivatives, on Federal Home Loan Bank Advances. Risk-Based Capital, Required Federal Home Loan Bank, Risk-Based Capital, Required Fair Value: Due Year 1-5 Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Mortgage loans held for portfolio, allowance for credit losses Allowance for credit losses on mortgage loans Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Document Period End Date Document Period End Date 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 Within 1 year Federal Home Loan Bank, Advances, Maturities Summary, in Next Rolling 12 Months Capital Equity [Text Block] Netting Adjustments and Cash Collateral-Derivative Liability Derivative Liability, Netting adjustments Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Transaction Market Method [Axis] Transaction Market Method [Axis] Federal funds sold Federal Funds Sold, Fair Value Disclosure Fair value as of the balance sheet date of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold Debt Securities by Class [Axis] Debt Securities by Class [Axis] Debt Securities by Classification as Prime, Alt-A, Option ARM, Alt-A, Other. Total Amortized Cost Financing Receivable, before Allowance for Credit Loss Total recurring fair value measurements – Liabilities Liabilities, Fair Value Disclosure Class B Putable Common Class B [Member] Entity Shell Company Entity Shell Company Capital [Abstract] Banking Regulation, Total Capital [Abstract] Advances Total Advances Federal Home Loan Bank, Advance Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Estimated Fair Value: 12 Months or More Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Regulatory Capital, Actual Federal Home Loan Bank, Regulatory Capital, Actual Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] After 1 year through 2 years Federal Home Loan Bank, Consolidated Obligations, Bonds, Weighted Average Interest Rate, Maturing In Rolling Year Two Weighted average interest rate for the Bank portion of joint and several obligations consisting of bonds issued by Federal Home Loan Bank (FHLBank) maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Proceeds from sales Proceeds from Sale and Maturity of Marketable Securities Document Fiscal Period Focus Document Fiscal Period Focus Net Income/(Loss) Net Income/(Loss) Net Income (Loss) Attributable to Parent, Net of Federal Home Loan Bank Assessments Unamortized premiums Loans and Leases Receivable, Unamortized Premiums Reflects the cumulative amount of premiums over the face amount of loans that are being amortized into income as an adjustment of yield. Total Liabilities Liabilities Leverage Capital, Actual Federal Home Loan Bank, Leverage Capital, Actual AFS securities Estimated Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Adjustable Interest Rate [Member] Adjustable Interest Rate [Member] Financial instruments with a variable or adjustable rate of interest. Regulatory Capital Ratio, Required Regulatory Capital Ratio, Required Regulatory capital ratio requirement as defined in the regulations. Proceeds from Other FHLBank Borrowings Proceeds from FHLBank Borrowings, Financing Activities After 3 years through 4 years Federal Home Loan Bank, Consolidated Obligations, Bonds, Weighted Average Interest Rate, Maturing In Rolling Year Four Weighted average interest rate for the Bank portion of joint and several obligations consisting of bonds issued by Federal Home Loan Bank (FHLBank) maturing in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Unrealized gain/(loss) included in AOCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Purchases Payments to Acquire Debt Securities, Available-for-Sale Deposits Interest Expense, Deposits Discount notes Discount notes Interest Expense, Other Short-Term Borrowings Concentration Risk [Line Items] Concentration Risk [Line Items] Change in net derivatives and hedging activities Unrealized Gain (Loss) on Derivatives Accumulated Defined Benefit Plans Adjustment Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] CO Bonds Par CO Bonds Par Long-Term Debt, Gross Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance Derivatives Not Designated as Hedging Instruments [Table Text Block] MBS - Other U.S. Obligations Single Family, Mortgage-backed Securities, Other US Obligations [Member] Debt securities collateralized by single family real estate mortgage loans (mortgages), issued by US government agencies, such as the Government National Mortgage Association (GNMA or Ginnie Mae). Excludes mortgage backed securities issued by Government-sponsored Enterprises (GSEs), which are not backed by the full faith and credit of the US Government. Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Asset Class [Domain] After 1 year through 2 years Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Two Payments to Extend Overnight Loans to Other FHLBanks Payments to Acquire Other Receivables After 1 year through 2 years Long-Term Debt, Maturities, Repayments of Principal in Rolling Year Two Related Party Transactions [Abstract] Related Party Transactions [Abstract] Cash Flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Financing Receivable, Nonaccrual Financing Receivable, Nonaccrual Loans and Leases Receivable Disclosure SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Schedule [Table] PLRMBS - Accretion or amortization in interest income associated with previous credit losses Other than Temporary Impairment, Credit Losses Recognized in Earnings, Total accretion or amortization This item represents the total accretion or amortization associated with other than temporary impairment (OTTI) of a debt security held or impaired PLRMBS, that was recognized in interest income. Balance (Shares) Balance (Shares) Shares, Issued Deposits Deposits Deposits, Domestic Interest-bearing deposits Proceeds from (Payments for) in Interest-Bearing Deposits in Banks Entity Emerging Growth Company Entity Emerging Growth Company Related Party Transaction [Line Items] Related Party Transaction [Line Items] In process of foreclosure, included above Mortgage Loans in Process of Foreclosure, Amount Mortgage Loans Held For Portfolio Mortgage loans held for portfolio Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Derivatives and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] US Treasury Securities US Treasury Securities [Member] Fixed Rate - Par Value Federal Home Loan Bank, Advances, Fixed Rate [Abstract] Gross Unrecognized Holding Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Entities [Table] Entities [Table] Fixed Rate - Total Federal Home Loan Bank, Advances, Fixed Rate HTM securities: Proceeds from Sale and Maturity of Held-to-Maturity Securities [Abstract] Derivative Liability, Fair Value, Gross Recognized Amount Derivative Liability, Subject to Master Netting Arrangement, before Offset Repaid Proceeds from FHLBank Advance, Investing Activities Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Restricted retained earnings Retained Earnings, Appropriated HTM Securities - Accrued Interest Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss AFS Securities Debt Securities, Available-for-Sale [Line Items] Interest Income: Interest and Dividend Income, Operating [Abstract] Net unrealized gain/(loss) on AFS securities Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent Level 1 Fair Value, Inputs, Level 1 [Member] Proceeds from maturities and paydowns Proceeds from Sale and Maturity of Held-to-Maturity Securities Fair Value, Option, Quantitative Disclosures Fair Value Option, Disclosures [Table Text Block] Derivative Assets Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Amount Outstanding Federal Home Loan Bank, Advance, Maturity, Rolling Year [Abstract] AFS securities: Debt Securities, Available-for-Sale [Abstract] Collateral [Domain] Collateral Held [Domain] Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Total Capital Stock Capital Stock Common Stock, Other Value, Outstanding Repurchase of capital stock (Value) Stock Repurchased and Retired During Period, Value Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] PLRMBS Residential Mortgage Backed Securities Residential Mortgage-Backed Securities [Member] Within 1 year Long-Term Debt, Maturities, Repayments of Principal in Next Rolling 12 Months After 1 year through 2 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Two Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Concentration Risk Type [Domain] Concentration Risk Type [Domain] Within 1 year Federal Home Loan Bank, Consolidated Obligations, Bonds, Weighted Average Interest Rate, Maturing In Next Twelve Rolling Months Weighted average interest rate for the Bank portion of joint and several obligations consisting of bonds issued by Federal Home Loan Bank (FHLBank) maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Discount notes Consolidated Obligation, Discount Notes [Member] Amount of joint and several obligations consisting of discount notes issued by Federal Home Loan Bank. Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Available-for-Sale Securities Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Total Restricted Retained Earnings Retained Earnings, Appropriated [Member] Investment Type [Axis] Investment Type [Axis] Cash dividends paid Payments of Ordinary Dividends, Common Stock Standby letters of credit fees fhlb_Standbylettersofcreditfees fhlb_Standbylettersofcreditfees Net increase/(decrease) in cash and due from banks Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Hedging Relationship [Axis] Hedging Relationship [Axis] Within 1 year Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Next Rolling 12 Months Derivative Liabilities Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Liabilities: Liabilities [Abstract] Weighted Average Interest Rate [Abstract] Debt Instrument, Interest Rate, Effective Percentage [Abstract] Gross Unrecognized Holding Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Advances, fair value under the fair value option Balance, beginning of the period Balance, end of the period Fair Value of advances under the fair value option Federal Home Loan Bank, Advance, Fair Value Disclosure Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Accrued Interest Receivable Financing Receivable, Accrued Interest, after Allowance for Credit Loss Other liabilities Other Liabilities Derivative [Table] Derivative [Table] Other, net Noninterest Income, Other Operating Income Interest Income from Advances Interest Income from Advances [Abstract] Interest Income from Advances Proceeds from issuance of capital stock Proceeds from Issuance of Common Stock Net change in fair value Other Comprehensive Income Net Change in Fair Value Of Other Than Temporary Impairment Securities Subsequent increases or decreases in fair value on OTTI Securities classified as AFS to the extent it does not exceed previously recorded non-credit OTTI. Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] HTM Securities Schedule of Held-to-Maturity Securities [Line Items] Deposits Deposits, Fair Value Disclosure After 2 years through 3 years Federal Home Loan Bank, Consolidated Obligations, Bonds, Weighted Average Interest Rate, Maturing In Rolling Year Three Weighted average interest rate for the Bank portion of joint and several obligations consisting of bonds issued by Federal Home Loan Bank (FHLBank) maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Cash Flows from Investing Activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] HTM Securities HTM securities Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Fair Value, Measurements, Recurring Fair Value, Recurring [Member] After 2 years through 3 years Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Three Proceeds from maturities and paydowns Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Document Quarterly Report Document Quarterly Report Schedule of Interest Rate Payment Terms for Debt Schedule of Consolidated Obligation Bonds By Interest Rate Payment Terms [Table Text Block] Tabular disclosure of interest rate payment terms for debt. AFS Securities Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Interest rate swaps Interest rate swaps Interest Rate Swap [Member] Consolidated Obligations Debt Disclosure [Text Block] Accrued interest payable Interest Payable Conventional Mortgage Loan Conventional Mortgage Loan [Member] Mandatorily redeemable capital stock Balance at the beginning of the period Balance at the end of the period Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount Unrestricted retained earnings Retained Earnings, Unappropriated Adjustable Rate - Par Value Federal Home Loan Bank, Advances, Floating Rate [Abstract] Fixed Rate - Due after 1 year Federal Home Loan Bank, Advance, Fixed Rate, after Year One Equity Component [Domain] Equity Component [Domain] Interest income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Measurement Input Type [Domain] Measurement Input Type [Domain] Mortgage loans held for portfolio Mortgage loans held for portfolio Loans Receivable, Fair Value Disclosure Percent of Interest Income from Advances Percent of Interest Income from Advances [Abstract] Percent of Interest Income from Advances After 3 years through 4 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Four Counterparty Name [Domain] Counterparty Name [Domain] Cash dividends on capital stock Dividends, Common Stock, Cash Total Capital Balance (Value) Balance (Value) Stockholders' Equity Attributable to Parent Equity, Attributable to Parent Federal funds sold Federal Funds Sold After 2 years through 3 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Three Real Estate [Domain] Real Estate [Domain] Discount notes Proceeds from Other Short-Term Debt Assets: Assets [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Financing Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Derivatives, Addition Credit Exposure, Net Derivatives, Addition Credit Exposure, Net Derivatives, Addition Credit Exposure, Net Hedged Item Type [Domain] Hedged Item Type [Domain] The name that identifies a derivative or a group of derivatives, by type of hedged item. Mortgage loans held for portfolio Interest and Fee Income, Loans, Consumer, Real Estate Fair Value, Measurements, Nonrecurring Fair Value, Nonrecurring [Member] HTM securities, fair value Estimated Fair Value Debt Securities, Held-to-Maturity, Fair Value Net change in deposits and other financing activities Proceeds from (Payment for) Other Financing Activity Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Advances Federal Home Loan Bank Advances, Fair Value Disclosure Federal Home Loan Bank Advances, Fair Value Disclosure Financing Receivable Portfolio Segment Financing Receivable Portfolio Segment [Domain] Other, net Other Noninterest Expense, Net Other Noninterest Expense, Net Callable Callable [Member] A debt obligation not collateralized by pledge, mortgage or other lien in the entity's assets and is callable. OTTI, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Entity Central Index Key Entity Central Index Key Delinquency Statistics [Abstract] Delinquency Statistics [Abstract] Delinquency Statistics [Abstract] Securities purchased under agreements to resell Interest Income, Securities Purchased under Agreements to Resell Net Interest Income After Provision for/(Reversal of) Credit Losses Interest Income (Expense), after Provision for Loan Loss Class B-2 Capital Stock Class B-2 Capital Stock Class B-2 Capital Stock Uncleared derivatives Over-the-Counter [Member] Schedule of Long-term Debt by Call Feature Schedule of Consolidated Obligation Bonds by Call Feature [Table Text Block] Tabular disclosure of consolidated obligations bonds outstanding by call feature. Net cash provided by/(used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Residential Portfolio Segment Residential Portfolio Segment [Member] Price Alignment Amount Price Alignment Amount [Member] Price Alignment Amount Interest-bearing deposits Interest Income, Deposits with Financial Institutions Income Statement [Abstract] Income Statement [Abstract] Capital: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report O 2026 Q2 Dividends O 2026 Q2 Dividends [Member] O 2026 Q2 Dividends Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Designated as Hedging Instrument Designated as Hedging Instrument [Member] After 5 years Long-Term Debt, Maturities, Repayments of Principal in Rolling after Year Five Payments for matured and retired consolidated obligations: Repayments of Long-Term Debt [Abstract] Fixed rate medium-term mortgage loans Loans Receivable With Fixed Rates Of Interest Medium Term [Member] A mortgage loan issued by a bank with a fixed rate of interest and a repayment period of 15 years or less. Interest-bearing Deposits Interest-Bearing Deposit Liabilities, Domestic City Area Code City Area Code Earlier of Redemption Term or Next Call Date Federal Home Loan Bank, Advances, Par Value, Earlier of Contractual Maturity or Next Call Date, Rolling Year [Abstract] Accumulated Other Comprehensive Income/(Loss) AOCI Attributable to Parent [Member] Amortized Cost of Hedged Asset, Fair Value Hedge Hedged Asset, Fair Value Hedge PLRMBS Subtotal PLRMBS Mortgage-Backed Securities, Issued by Private Enterprises [Member] Bonds, fair value under the fair value option Bonds Balance, beginning of the period Balance, end of the period Debt Instrument, Fair Value Disclosure Fixed Rate - Due within 1 year Federal Home Loan Bank, Advance, Fixed Rate, Year One 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] AFS Securities - Pledged as Collateral that may be Repledged Debt Securities, Available-for-Sale, Restricted Statement [Line Items] Statement [Line Items] Total Assets Assets Entity [Domain] Entity [Domain] Total Interest Expense Interest Expense, Operating After 4 years through 5 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Five New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Other Comprehensive Income/(Loss): Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Total Interest Income Interest and Dividend Income, Operating Basis Adjustment for Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Federal funds sold Increase (Decrease) in Federal Funds Sold Capital stock reclassified from/(to) mandatorily redeemable capital stock, net (Shares) Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Shares Conversion of Class B Stock (Value) Conversion of Stock, Amount Converted Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Cumulative adjustments Disclosure [Abstract] Cumulative adjustments Disclosure [Abstract] Cumulative adjustments Disclosure [Abstract] Other assets Increase (Decrease) in Other Operating Assets Debt Securities by Class [Domain] Debt Securities by Class [Domain] Debt Securities by Classification as Prime, Alt-A, Option ARM, Alt-A, Other. Issuance of capital stock (Shares) Stock Issued During Period, Shares, New Issues Bonds Bonds Interest Expense, Other Long-Term Debt After 4 years through 5 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Five Hedged Item Type [Axis] Hedged Item Type [Axis] The name that identifies a derivative or a group of derivatives, by type of hedged item. U.S. Treasury obligations: Other Than Mortgage Backed Securities [Member] Represents the total of non-mortgage backed securities, which may be issued by federal, state or local government and/or by other non-mortgage related entities. Measurement Basis [Axis] Measurement Basis [Axis] Repurchase of capital stock (Shares) Stock Repurchased and Retired During Period, Shares Originated Payments for FHLBank Advance, Investing Activities Adjustable Rate - Due after 1 year Federal Home Loan Bank, Advance, Floating Rate, after Year One After 2 years through 3 years Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three Mortgage loans held for portfolio: Payments for (Proceeds from) Loans and Leases [Abstract] After 4 years through 5 years Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Five After 5 years Federal Home Loan Bank, Advances, Maturities Summary, after Rolling Year Five Par Value Federal Home Loan Bank, Consolidated Obligations, Discount Notes, Par Par value of the amount of joint and several obligations consisting of discount notes issued by Federal Home Loan Banks (FHLBanks). AFS Unrealized Gain/(Loss) on AFS Securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Affordable Housing Program (AHP) payable Federal Home Loan Bank, Affordable Housing Program Obligation Subsequent Event Type [Domain] Subsequent Event Type [Domain] Total Retained Earnings Retained Earnings [Member] AOCI Unrealized gain/loss, Available-for-sale AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Capital stock, Shares, Outstanding Common Stock, Shares, Outstanding Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Mortgage Loan Delinquency Statistics Financing Receivable, Past Due [Line Items] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Total Comprehensive Income/(Loss) Comprehensive Income (Loss) Comprehensive Income (Loss), Net of Federal Home Loan Bank Assessments, Attributable to Parent 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 Provision for/(reversal of) credit losses Financing Receivable, Credit Loss, Expense (Reversal) Liabilities Liabilities, Fair Value Disclosure [Abstract] Total amount of gain/(loss) for the period included in earnings relating to assets held at the end of the period Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings Derivative Asset Fair Value Gross Liability and Right To Reclaim Cash Offset Derivative Asset Fair Value Gross Liability and Right To Reclaim Cash Offset Fair value of asset associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and right to receive cash collateral under master netting arrangements. Fixed Interest Rate Fixed Interest Rate [Member] Financial instruments with a fixed rate of interest. Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Schedule of Derivative Instruments, Offsetting Derivative Assets Offsetting Assets [Table Text Block] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Cash Flows from Financing Activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Bonds Repayments of Other Long-Term Debt Financial Instruments [Domain] Financial Instruments [Domain] Financial Instruments [Domain] Derivative assets, net Total Derivative Assets and Derivative Liabilities Total Derivative Assets and Derivative Liabilities Derivative Asset Regulatory Capital Ratio, Actual Federal Home Loan Bank, Regulatory Capital Ratio, Actual Offsetting [Abstract] Offsetting [Abstract] Voluntary housing and community investment contributions Voluntary Charitable Contribution The voluntary charitable contribution was made by the Bank to the Quality Jobs Fund, a donor-advised fund established to support quality jobs growth and small business expansion. Schedule of Deposit Liabilities by Component Deposit Liabilities, Type [Table Text Block] Estimated Fair Value Estimate of Fair Value Measurement Estimate of Fair Value Measurement [Member] MBS - GSEs Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Issuance of capital stock (Value) Stock Issued During Period, Value, New Issues Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Accrued interest payable Increase (Decrease) in Interest Payable, Net Adjustable Rate - Total Federal Home Loan Bank, Advances, Floating Rate Derivative Liability, Fair Value, Amount Offset Against Collateral Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Valuation adjustments for hedging activities Federal Home Loan Bank, Consolidated Obligations, Bonds, Adjustment for Hedging Activities Amount of unrealized gain (loss) recognized in earnings for the cumulative period of the debt obligation in a fair value hedge, as offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. Risk-Based Capital, Actual Federal Home Loan Bank, Risk-Based Capital, Actual Percentage of Total Interest Income from Advances Interest Income, Advances [Member] Interest Income, Advances Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Related Party Transaction [Table] Related Party Transaction [Table] (Provision for)/reversal of credit losses Provision for Other Credit Losses Dividends, Cash Declared, Annualized Rate Dividends, Cash Declared, Annualized Rate Amount of dividends declared, annualized rate. After 4 years through 5 years Federal Home Loan Bank, Consolidated Obligations, Bonds, Weighted Average Interest Rate, Maturing In Rolling Year Five Weighted average interest rate for the Bank portion of joint and several obligations consisting of bonds issued by Federal Home Loan Bank (FHLBank) maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. AFS Securities (Amortized Cost & Fair Values) Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Total par amount Long-Term Debt, Weighted Average Interest Rate, at Point in Time Multifamily Multifamily [Member] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Estimated Fair Value: Within 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Current Fiscal Year End Date Current Fiscal Year End Date After 4 years through 5 years Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Five Mandatorily Redeemable Capital Stock [Roll Forward] Mandatorily Redeemable Capital Stock [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Derivative [Line Items] Derivative [Line Items] Collateral [Axis] Collateral Held [Axis] Capital stock reclassified from/(to) mandatorily redeemable capital stock, net (Value) Transfers of capital stock to mandatorily redeemable capital stock Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value PLRMBS - Previous Credit Losses Other-than-temporary-impairment (OTTI) recognized previously Other-than-temporary-impairment (OTTI) recognized previously Entity File Number Entity File Number Valuation adjustments under fair value option Fair Value Over/(Under) Principal Balance, Advances Federal Home Loan Bank, Advances, Valuation Adjustments under Fair Value Option Fair Value: Due within Year 1 Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value AFS Securities (Redemption Terms) Investments Classified by Contractual Maturity Date [Table Text Block] Capital stock, Shares, Issued 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 Entity Information Entity Information [Line Items] Unamortized discounts Loans and Leases Receivable, Unamortized Discounts Reflects the cumulative amount of discounts from the face amount of loans that are being amortized into income as an adjustment of yield. Top Ten Borrowers Top Ten Borrowers [Member] Top Ten Borrowers Unrealized Losses: 12 Months or More Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Accumulated Other Comprehensive Income/(Loss) Comprehensive Income (Loss) Note [Text Block] Total adjustments Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity Equity Components [Axis] Equity Components [Axis] Equity Components [Axis] Other operating expense Other Cost and Expense, Operating Capital [Line Items] Class of Stock [Line Items] Entity Interactive Data Current Entity Interactive Data Current Available-for-sale Securities Available-for-sale Securities Available-for-Sale Securities [Member] Non-Interest Expense: Noninterest Expense [Abstract] Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Amortized Cost: Due Year 1-5 Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Entity Small Business Entity Small Business Basis Adjustment for Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Fair value option valuation adjustments Fair Value, Option, Aggregate Differences, Consolidated Obligation Bonds This item represents the gain (loss) brought about by the difference between the aggregate fair value and the aggregate unpaid principal balance of consolidated obligation bonds that have contractual principal amounts and for which the fair value option has been elected. Unamortized discounts Debt Instrument, Unamortized Discount Basis Adjustment for Active Fair Value Hedged Asset Cumulative Increase Decrease Hedged Asset Active Fair Value Hedge Cumulative Increase Decrease Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, active as of the balance sheet date. Advances: Proceeds From Sale of Federal Home Loan Bank Advances Abstract [Abstract] -- None. No documentation exists for this element. -- Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Net Interest Income Interest Income (Expense), Operating Derivative Asset, Fair Value, Amount Offset Against Collateral Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Document Type Document Type 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] After 2 years through 3 years Long-Term Debt, Maturities, Repayments of Principal in Rolling Year Three AFS Securities (Unrealized Losses) Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] AFS securities, allowance for credit losses Allowance for Credit Losses Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Class B-1 Capital Stock Class B-1 Capital Stock Class B-1 Capital Stock Transaction Market Method [Domain] Transaction Market Method [Domain] Net change in pension and postretirement benefits Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent After 2 years through 3 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Three Percentage of Total Advances Outstanding Advances Advances [Member] Advances (Loans) by the Federal Home Loan Bank (FHLBank) to member financial institutions. May also include former member financial institutions. Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Unrealized Losses: Within 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Total other comprehensive income/(loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Advances Interest Income, Federal Home Loan Bank Advances Fair Value Over/(Under) Principal Balance, CO Bonds Fair Value, Option, Aggregate Differences, Long-Term Debt Instruments Income/(Loss) Before Assessment Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain] Commitments and Contingencies (Note 12) Commitments and Contingencies Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Securities purchased under agreements to resell Proceeds from (Payments for) Securities Purchased under Agreements to Resell Counterparty Name Counterparty Name [Axis] Liabilities and Capital Liabilities and Equity [Abstract] Basis Adjustment for Active Fair Value Hedged Liability Cumulative Increase Decrease Hedged Liability Active Fair Value Hedge Cumulative Increase Decrease Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk, active as of the balance sheet date. Within 1 year Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Next Rolling 12 Months Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Aggregate fair value of uncleared derivative instruments with credit risk-related contingent features in a net derivative liability position (before cash collateral and related accrued interest) Derivative, Net Liability Position, Aggregate Fair Value Fair Value Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Supplemental Disclosures: Supplemental Cash Flow Information [Abstract] Other assets Other Assets 30 to 59 Days Past Due Financial Asset, 30 to 59 Days Past Due [Member] Entity Tax Identification Number Entity Tax Identification Number Cumulative adjustments table Derivative Instruments and Hedging Activities Disclosures [Table] Cash and due from banks Cash and Due from Banks Legal Entity [Axis] Legal Entity [Axis] Financial Asset, Not Past Due Financial Asset, Not Past Due [Member] Amortized Cost of Hedged Liability, Fair Value Hedge Hedged Liability, Fair Value Hedge Advances Outstanding Advances Outstanding [Abstract] Advances Outstanding State housing agency obligations: State Housing Agency Notes [Member] State Housing Agency Notes Transfers of shares between Class B-1 and Class B-2 Net Transfers Of Shares Between Class B-1 And Class B-2, Value Net Transfers Of Shares Between Class B-1 And Class B-2, Value 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 Federal Home Loan Bank, Advances, Weighted Average Interest Rate Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Measurement Frequency [Domain] Measurement Frequency [Domain] Total net gain/(loss) related to derivatives not designated as hedging instruments Derivatives Not Designated As Hedging Before Price Alignment [Member] Derivatives Not Designated As Hedging Before Price Alignment Interest Expense: Interest Expense, Operating and Nonoperating [Abstract] Compensation and benefits Labor and Related Expense Interest and Dividends Payable, Current Interest and Dividends Payable, Current Customer [Domain] Customer [Domain] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Amortized Cost: Due Year 5-10 Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Measurement Input Type [Axis] Measurement Input Type [Axis] Payments for repurchase of capital stock Payments for Repurchase of Common Stock MBS Collateralized Mortgage-Backed Securities [Member] Discount notes Short-Term Debt, Fair Value Derivative Instruments, Gain (Loss) [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Interest Rate Contract Interest Rate Contract [Member] Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) AHP assessment Federal Home Loan Bank, Affordable Housing Program Obligation, Assessment Expense Total Retained Earnings Retained Earnings (Accumulated Deficit) Transaction with Member Officer or Director Transaction with Member Officer or Director [Member] Transactions with members that have an officer or director serving on the Bank’s Board of Directors. In instances where the member has an officer or director serving on the Bank’s Board of Directors, all of the aforementioned transactions with the member are subject to the same eligibility and credit criteria, as well as the same conditions, as comparable transactions with all other members, in accordance with regulations governing the operations of the FHLBanks. Schedule of Short-term Debt Schedule of Short-Term Debt [Table Text Block] Class B Capital Stock Class B Capital Stock Class B Capital Stock Consolidated Obligations, Bonds Commitments to issue consolidated obligation bonds, par Consolidated Obligations, Bonds [Member] Amount of joint and several obligations consisting of discount notes issued by Federal Home Loan Banks (FHLBanks). After 5 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, after Rolling Year Five Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Common Stock Common Stock [Member] Fair Value of AFS Securities Debt Securities, Available-for-Sale Fair Value Measurement [Domain] Fair Value Measurement [Domain] Cover [Abstract] Cover [Abstract] Total amount of unrealized gain/(loss) for the period included in AOCI relating to assets held at the end of the period Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI Interest-bearing deposits Interest-bearing Deposits, Fair Value Disclosure Fair value disclosure for banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet Not Designated as Hedging Instrument, Economic Hedge Not Designated as Hedging Instrument, Economic Hedge Not Designated as Hedging Instrument, Economic Hedge [Member] Off-Balance Sheet Commitments Off-Balance Sheet Commitments [Table Text Block] Tabular disclosure of short-term or long-term contractual arrangements and obligations that, in accordance with GAAP, are not recognized on the balance sheet or may be recorded on the balance sheet in amounts that are different from the full contract or notional amount of the transactions. Bonds Proceeds from Issuance of Other Long-Term Debt Excess Capital to Assets Excess Capital to Assets Excess Capital to Assets Weighted average interest rate Short-Term Debt, Weighted Average Interest Rate, at Point in Time Class B-1 Putable Common Class B-1 [Member] Common Class B-1 Derivative Contract Type [Domain] Derivative Contract Type [Domain] Derivative Contract [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Percentage of Total Capital Stock Outstanding Concentration Risk, Percentage Excess Capital Banking Regulation, Total Risk-Based Capital, Excess, Actual Percentage of Total Advances Outstanding Percentage of Total Advances Outstanding [Abstract] Percentage of Total Advances Outstanding Earlier of Redemption Term or Next Put Date Federal Home Loan Bank, Advances, Par Value, Earlier of Contractual Maturity or Next Put or Convert Date, Rolling Year [Abstract] Financial Asset, Past Due Financial Asset, Past Due [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Total Liabilities and Capital Liabilities and Equity Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Weighted Average Interest Rates Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract] Schedule of Maturities of Long-term Debt by Contractual or Next Call Date Schedule of Maturities of Consolidated Obligation Bonds by Contractual or Next Call Date [Table Text Block] Tabular disclosure of consolidated obligation bonds outstanding by year of contractual maturity or next call date. After 3 years through 4 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Four Other liabilities Increase (Decrease) in Other Operating Liabilities Fair Value by Asset Class [Axis] Asset Class [Axis] Schedule of Derivative Instruments By Type, Gain (Loss) in Statement of Financial Performance Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Schedule of Accounts, Notes, Loans and Financing Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Collateral Already Posted, Non-Cash, Aggregate Fair Value Collateral Already Posted, Non-Cash, Aggregate Fair Value Collateral Already Posted, Non-Cash, Aggregate Fair Value Step-up Interest Rate [Member] Step-up Interest Rate [Member] Financial instruments with increasing fixed rates for specified intervals over the life of the instruments. Class B-2 Putable Common Class B-2 [Member] Class Class B-2 Putable Stock Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Regulatory Capital, Required Federal Home Loan Bank, Regulatory Capital, Required Schedule of Mandatorily Redeemable Capital Stock Schedule of Mandatorily Redeemable Capital Stock [Table Text Block] Tabular disclosure of the changes in the balance of mandatorily redeemable capital stock. Financing Receivable Portfolio Segment Financing Receivable Portfolio Segment [Axis] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Obligation with Joint and Several Liability Arrangement, Amount Outstanding Obligation with Joint and Several Liability Arrangement, Amount Outstanding Total par value Total bonds, par value Federal Home Loan Bank, Consolidated Obligations, Bonds, Par Par value of the amount of joint and several obligations consisting of bonds issued by Federal Home Loan Banks (FHLBanks). Fixed Rate Long Term mortgage loans Loans Receivable With Fixed Rates Of Interest Long Term [Member] A mortgage loan issued by a bank with a fixed rate of interest and a repayment period of more than 15 years. Leverage Ratio, Actual Federal Home Loan Bank, Leverage Ratio, Actual Change in net fair value adjustment on advances and consolidated obligation bonds held under the fair value option Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option Hedging Designation [Domain] Hedging Designation [Domain] After 1 year through 2 years Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Two Net change in borrowings from other FHLBanks Increase (Decrease) in Loans from Federal Home Loan Banks Class of Stock [Domain] Class of Stock [Domain] Fair Value Option, Principal Balance, Advances Fair Value Option, Principal Balance, Advances Represents the outstanding amount of the unpaid principal balance of Federal Home Loan Bank Advances for which the fair value option has been elected. Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] 60 to 89 Days Past Due Financial Asset, 60 to 89 Days Past Due [Member] Debt Security Category [Axis] Debt Security Category [Axis] Total fair value measurements – Assets Assets, Fair Value Disclosure AFS securities Interest Income, Debt Securities, Available-for-Sale, Operating Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Other adjustments, net Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Securities purchased under agreements to resell Securities Purchased under Agreements to Resell Entity Filer Category Entity Filer Category Estimated Fair Value: Total Debt Securities, Available-for-Sale, Unrealized Loss Position Accumulated other comprehensive income/(loss) (AOCI) Accumulated Other Comprehensive Income (Loss), before Federal Home Loan Bank Assessments Netting adjustments and cash collateral Derivative Asset, Netting adjustments Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Dividends [Axis] Dividends [Axis] Schedule of Derivative Instruments, Offsetting Derivative Liabilities Offsetting Liabilities [Table Text Block] Amortized Cost: Due within Year 1 Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Accrued interest receivable Interest Receivable Interest Receivable Total consolidated obligations Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure Fair value portion of Amount of joint and several obligations consisting of consolidated obligation bonds and discount notes issued by Federal Home Loan Banks (FHLBanks). Net gain/(loss) on derivatives Derivative Instruments Not Designated as Hedging Instruments, After Price Alignment, Gain (Loss), Net Derivative Instruments Not Designated as Hedging Instruments, After Price Alignment, Gain (Loss), Net Net gain/(loss) on derivatives Gain (Loss) on Derivative Instruments, Net, Pretax Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Within 1 year Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Next 12 Rolling Months PurchaseOfInvestmentSecuritiesTradedButNotYetSettled Purchase Of Investment Securities Traded,But Not Yet Settled Purchase Of Investment Securities Traded,But Not Yet Settled Deposits [Abstract] Deposits [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Net Gains Losses On Qualifying Active Fair Value Hedging Relationships Net Gains Losses On Qualifying Active Fair Value Hedging Relationships Net Gains Losses On Qualifying Active Fair Value Hedging Relationships Securities purchased under agreements to resell Securities Purchased under Agreements to Resell, Fair Value Disclosure Fair value as of the balance sheet date of funds outstanding loaned in the form of security resale agreements Valuation adjustments for hedging activities Federal Home Loan Bank, Advances, Valuation Adjustments for Hedging Activities Capital [Table] Stock, Class of Stock [Table] Single-family Single Family [Member] Off balance sheet commitments Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability Derivative liabilities, net Derivative Assets and Derivative Liabilities Derivative Liability After 5 years Federal Home Loan Bank, Consolidated Obligations, Bonds, Weighted Average Interest Rate, Maturing After Rolling Year Five Weighted average interest rate for the Bank portion of joint and several obligations consisting of bonds issued by Federal Home Loan Bank (FHLBank) maturing after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Noninterest-bearing Deposits Noninterest-Bearing Deposit Liabilities, Domestic Entity Address, Address Line One Entity Address, Address Line One Total Non-Interest Expense Noninterest Expense After 1 year through 2 years Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two Commitments to fund additional advances Loan Origination Commitments [Member] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Discount notes Repayments of Other Short-Term Debt AFS Securities - Accrued Interest Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss Recently Issued Accounting Guidance Accounting Standards Update and Change in Accounting Principle [Text Block] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Statement [Table] Statement [Table] Leverage Capital, Required Federal Home Loan Bank, Leverage Capital, Required Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Serious delinquencies as a percentage of total mortgage loans outstanding Loans and Leases Receivable, Serious Delinquencies Ratio Loans that are 90 days or more past due or in the process of foreclosure (including past due or current loans in the process of foreclosure) as a percentage of total mortgage loans outstanding. Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Adjustable Rate - Due within 1 year Federal Home Loan Bank, Advance, Floating Rate, Year One Office of Finance Office of Finance, Cost Assessed on Federal Home Loan Bank Payments for repurchase/redemption of mandatorily redeemable capital stock Repayments of Mandatory Redeemable Capital Securities Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] After 3 years through 4 years Long-Term Debt, Maturities, Repayments of Principal in Rolling Year Four Federal Home Loan Banks [Abstract] Federal Home Loan Banks [Abstract] Derivative Asset, Fair Value, Gross Recognized Amount Derivative Asset, Subject to Master Netting Arrangement, before Offset SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] Total Capital Stock Class of Stock Disclosures [Abstract] Discount notes Carrying Value Federal Home Loan Bank, Consolidated Obligations, Discount Notes Net gain/(loss) on advances and consolidated obligation bonds held under fair value option Fair Value, Option, Changes in Fair Value, Gain (Loss) Collateral Already Posted, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value U.S. Treasury obligations US Treasury Notes Securities [Member] Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]