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Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Loan Origination Commitments [Member] Loan Origination Commitments [Member] Federal Home Loan Bank, Advances, Floating Rate, after One Year Federal Home Loan Bank, Advance, Floating Rate, after Year One Depreciation and amortization Depreciation, Amortization and Accretion, Net [Abstract] Financial Instruments [Domain] Financial Instruments [Domain] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Net decrease in securities purchased under agreements to resell Proceeds from (Payments for) Securities Purchased under Agreements to Resell Percent of Fixed Rate Long Term Debt Swapped to An Adjustable Rate Percent of Fixed Rate Consolidated Obligation Bonds Swapped to An Adjustable Rate Percent of Fixed Rate Consolidated Obligation Bonds Swapped to An Adjustable Rate Advances by Earlier 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Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Purchase Commitment, Excluding Long-term Commitment [Domain] Purchase Commitment, Excluding Long-Term Commitment [Domain] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Three Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Three Past due 90 days or more and still accruing interest Financing Receivable, 90 Days or More Past Due, Still Accruing Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Text Block] Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years Capital [Line Items] Capital [Line Items] Capital [Line Items] Debt, Maturities, Repayments of Principal in Next Twelve Months, Weighted Average Interest Rate Debt, Maturities, Repayments of Principal in Next Twelve Months, Weighted Average Interest Rate Debt, Maturities, Repayments of Principal in Next Twelve Months, Weighted Average Interest Rate Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, after Rolling Year Five Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, after Rolling Year Five Short-term Debt, Weighted Average Interest Rate, at Point in Time Short-Term Debt, Weighted Average Interest Rate, at Point in Time Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Next Rolling Twelve Months Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Next Rolling 12 Months Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Affordable Housing Program [Text Block] Affordable Housing Program [Text Block] Derivative [Table] Derivative [Table] Entity Small Business Entity Small Business Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Other operating expenses Other Cost and Expense, Operating Derivatives Instruments and Hedging Activities Disclosure [Abstract] Derivatives Instruments and Hedging Activities Disclosure [Abstract] Derivatives Instruments and Hedging Activities Disclosure [Abstract] Document Transition Report Document Transition Report Consolidated Obligation Bonds [Member] Consolidated Obligation Bonds [Member] Amount of joint and several obligations consisting of discount notes issued by Federal Home Loan Bank. Underlying Securities Award Underlying Securities Amount Bonds Repayments of Other Long-Term Debt Available-for-sale Securities, Gross Realized Gains Debt Securities, Available-for-Sale, Realized Gain Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Debt Instrument, Unamortized Premium Debt Instrument, Unamortized Premium Dividends stock annualized percentage Dividend Stock Annualized Percentage Dividends on capital stock Membership Investment Requirement, Maximum Dollar Amount Membership Investment Requirement, Maximum Dollar Amount Membership Investment Requirement, Maximum Dollar Amount Activity Based % Special Advances Program 2020 Activity Based % Requirement, Special Advances Program 2020 Activity Based % Requirement, Special Advances Program 2020 Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Derivative Asset, Fair Value, Amount Not Offset Against Collateral Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Adjustment to initially apply new accounting guidance Equity, Including Portion Attributable to Noncontrolling Interest Troubled debt restructurings Financing Receivable, Modified, Accumulated Document Type Document Type Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Federal Home Loan Bank Advances, Maturities, Amortizing Advances Federal Home Loan Bank Advances, Maturities, Amortizing Advances at Balance Sheet Date Federal Home Loan Bank Advances, Maturities, Amortizing Advances at Balance Sheet Date Affordable Housing Program assessment AHP assessment Affordable Housing Program Assessments Offsetting Assets, Collateral Not Offset in the Statement of Condition Offsetting Assets, Collateral Not Offset in the Statement of Condition Amount of collateral not offset in the Statement of Condition on assets that are subject to enforceable master netting arrangements. Recently Adopted Accounting Guidance [Abstract] Recently Issued Accounting Guidance [Abstract] Recently Issued Accounting Guidance Statistical Measurement [Axis] Statistical Measurement [Axis] Net receipts (payments) on derivative contracts with financing elements Payments for (Proceeds from) Hedge, Financing Activities Loans Receivable With Fixed Rates Of Interest Long Term [Member] 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 [Member] Advances [Line Items] Advances [Line Items] Advances [Line Items] Other Liabilities us-gaap_OtherLiabilitiesMember_FHLBD [Member] us-gaap_OtherLiabilitiesMember_FHLBD Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Mortgage Loans On Real Estate, Original Contractual Terms, Medium-Term Loan Mortgage Loans On Real Estate, Original Contractual Terms, Medium-Term Loan Mortgage Loans On Real Estate, Original Contractual Terms, Medium-Term Loan Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Proceeds from FHLBank Borrowings, Financing Activities Proceeds from FHLBank Borrowings, Financing Activities Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Five Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Five Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four Financial Standby Letter of Credit [Member] Financial Standby Letter of Credit [Member] NetInterestSettlements [Member] NetInterestSettlements [Member] net interest settlements [Member] Entity Information [Line Items] Entity Information [Line Items] Interest Rate Payment Term By Interest Rate Type [Axis] Interest Rate Payment Term By Interest Rate Type [Axis] Interest Rate Payment Term By Interest Rate Type [Axis] Net Gains (Losses) on Fair Value and Cash Flow Hedging Relationships [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Net losses on other assets carried at fair value Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Payments of FHLBank Borrowings, Financing Activities Payments of FHLBank Borrowings, Financing Activities Advances (Notes 6, 8 and 9) Federal Home Loan Bank Advances Federal Home Loan Bank, Advance Multifamily [Member] Multifamily [Member] Accumulated Other Comprehensive Income (Loss) [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Activity Based % Requirement, Special Advances Program 2021 Modification Activity Based % Requirement, Special Advances Program 2021 Modification Activity Based % Requirement, Special Advances Program 2021 Modification Securities held at end of period Securities held at end of period [Member] Securities held at end of period Bonds Interest Expense, Other Long-term Debt Interest Expense, Other Long-Term Debt Investments, Debt and Equity Securities [Abstract] Purchases of mortgage loans held for portfolio Payment for Acquisition, Loan, Held-for-Investment Gain (Loss) on Investments by Category [Axis] Debt Security Category [Axis] Schedule of Interest Rate Payment Terms For Investments [Table Text Block] Schedule of Interest Rate Payment Terms For Investments [Table Text Block] Schedule of interest rate payment terms for investments. Postretirement benefit plan Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent [Abstract] Actuarial gain (loss) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Schedule of Advances Classified by Contractual Maturity Date or Next Put Date [Table Text Block] Schedule of Advances Classified by Contractual Maturity Date or Next Put Date [Table Text Block] Schedule of Advances Classified by Contractual Maturity Date or Next Put Date [Table Text Block] Over the Counter [Member] Over-the-Counter [Member] Excess Non-Cash Collateral Received Customer Securities for which Entity has no Right to Sell or Repledge, Fair Value Customer Securities for which Entity has no Right to Sell or Repledge, Fair Value Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer American General Life Insurance Company and affiliated institutions American General Life Insurance Company and affiliated institutions [Member] American General Life Insurance Company and affiliated institutions Schedule of Consolidated Obligation Bonds by Call Feature [Table Text Block] Schedule Of Consolidated Obligation Bonds By Call Feature [Table Text Block] Schedule of Callable and Noncallable Consolidated Obligations Bonds Outstanding. Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Security sold under agreement to repurchase (Note 12) Securities Sold under Agreements to Repurchase Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months Long-Term Debt, Maturities, Repayments of Principal in Next Rolling 12 Months Amortized Cost of Sold Available-for-sale Securities Amortized Cost of Sold Available-for-sale Securities Amortized Cost of Sold Available-for-sale Securities Banks [Axis] Banks [Axis] Banks [Axis] Schedule of Unrealized Loss on Investments [Table Text Block] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Four Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Four Derivative Liability, Fair Value Cash Received or Remitted Exceeding Variation Margin Requirement Derivative Liability Fair Value Cash Remitted Exceeding Variation Margin Requirement DerivativeLiabilityFairValueCashRemittedExceedingVariationMmarginRequirement Decrease in other liabilities Increase (Decrease) in Other Operating Liabilities ASU2016-02 and ASU2017-12 [Abstract] [Abstract] ASU2016-02 and ASU2017-12 [Abstract] [Abstract] ASU2016-02 and ASU2017-12 [Abstract] [Abstract] Federal Home Loan Bank, Risk-Based Capital, Required Federal Home Loan Bank, Risk-Based Capital, Required Debt Securities, Held-to-Maturity, Sale Debt Securities, Held-to-Maturity, Sale Premises and equipment, net Property, Plant and Equipment, Net Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Two Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Two Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Consolidated obligations (Note 10) Federal Home Loan Bank, Consolidated Obligations [Abstract] Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Purchases of premises, equipment and computer software Payments for (Proceeds from) Productive Assets Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Payments for maturing and retiring consolidated obligations Repayments of Long-Term Debt [Abstract] Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Transaction [Domain] Transaction [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Type of Adoption [Domain] Accounting Standards Update [Domain] Purchases of trading securities Payment for Acquisition, Trading Security, Held-for-Investment Activity Based Investment Requirement, Percent of Outstanding Advances 2020 Modification Activity Based Investment Requirement, Percent of Outstanding Advances 2020 Modification Activity Based Investment Requirement, Percent of Outstanding Advances 2020 Modification Current Fiscal Year End Date Current Fiscal Year End Date Loans Made to Other FHLBanks [Roll Forward] Borrowings From Other FHLBanks [Roll Forward] Borrowings From Other FHLBanks [Roll Forward] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss fhlbd_HeldToMaturitySecuritiesDisclosureTextBlock fhlbd_HeldToMaturitySecuritiesDisclosureTextBlock [Text Block] fhlbd_Held To Maturity Securities Disclosure Text Block. Interest Income, Loans to Other Federal Home Loan Banks Interest Income, Loans to Other Federal Home Loan Banks Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Held-to-maturity, Debt Securities Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Held-to-Maturity, Debt Securities Held-to-maturity securities (b) (Notes 5, 8 and 9) Held-to-maturity securities Debt Securities, Held-to-maturity Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Derivative liabilities (Notes 12 and 13) Derivative Liabilities Derivative liabilities Derivative Liability Derivative clearing fees Other Noninterest Expense Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Amortization of prior service cost included in net periodic benefit cost/credit Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Interest Rate Contract [Member] Interest Rate Contract [Member] Step Down [Member] Step Down [Member] Step Down [Member] Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Stock, shares Common Stock Dividends, Shares Net proceeds from issuance of consolidated obligations Proceeds from Issuance of Long-Term Debt [Abstract] Discount notes Repayments of Other Short-Term Debt SingleFamilyMortgageBackedSecurities [Member] SingleFamilyMortgageBackedSecurities [Member] Securities collateralized by single family real estate mortgage loans. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Leverage Ratio, Required Leverage Ratio, Required Leverage Ratio, Required Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Derivative, Collateral, Right to Reclaim Securities That Can Not Be Sold or Repledged Derivative, Collateral, Right to Reclaim Securities That Can Not Be Sold or Repledged Derivative, Collateral, Right to Reclaim Securities That Can Not Be Sold or Repledged Financing Receivable, Past Due [Table Text Block] Financing Receivable, Past Due [Table Text Block] Schedule of Advances Classified by Contractual Maturity Date or Next Call Date [Line Items] Schedule of Advances Classified by Contractual Maturity Date or Next Call Date [Table Text Block] [Line Items] [Line Items] for Schedule of Advances Classified by Contractual Maturity Date or Next Call Date [Table Text Block] [Table] Cash Collateral Remitted in Excess of Derivative Liability cash collateral remitted in excess of derivative liability cash collateral remitted in excess of derivative liability Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Federal Home Loan Bank of Topeka Federal Home Loan Bank of Topeka [Member] External Credit Rating, Investment Grade [Member] External Credit Rating, Investment Grade [Member] Measure: Measure [Axis] Provision for credit losses Financing Receivable, Credit Loss, Expense (Reversal) Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, due in Next Rolling Twelve Months Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, due in Next Rolling Twelve Months Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, Due in Next Rolling Twelve Months Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value Financing Receivable, Originated, Current Fiscal Year and Four Preceding Fiscal Years Financing Receivable, Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years Financing Receivable, Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years Variable Rate [Member] Variable Rate [Member] Variable Rate [Member] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Mandatorily redeemable capital stock Dividends Common Stock Mandatorily Redeemable Capital Stock Dividends paid through issuance of mandatorily redeemable capital stock CAPITAL (Note 14) Banking Regulation, Total Capital [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Federal Funds Sold, Fair Value Disclosure Federal Funds Sold, Fair Value Disclosure Federal Funds Sold, Fair Value Disclosure Concessions on consolidated obligations Amortization of Debt Issuance Costs Entity Tax Identification Number Entity Tax Identification Number Federal Home Loan Bank Advances Putable Option [Member] Federal Home Loan Bank, Advances, Putable Option [Member] 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] Assets and Liabilities Subject to Offsetting [Text Block] Assets and Liabilities Subject to Offsetting [Text Block] Assets and Liabilities Subject to Offsetting [Text Block] InterestIncomeFederalHomeLoanBankAdvances u.s. gaap - InterestIncomeFederalHomeLoanBankAdvances u.s. gaap - InterestIncomeFederalHomeLoanBankAdvances American General Life Insurance Company American General Life Insurance Company [Member] American General Life Insurance Company Common Stock, Shares, Issued Common Stock, Shares, Issued Net Gains (Losses) on Derivatives and Hedging Activities Recorded in Non-interest Income [Table Text Block] Derivatives Not Designated as Hedging Instruments [Table Text Block] Transactions with Other FHLBanks (Note 18) Loans from other FHLBanks, Beginning of period Loans from other FHLBanks, End of period Loans from Other Federal Home Loan Banks Advances by Redemption Terms [Table] Advances by Redemption Terms [Table] Advances by Redemption Terms Asset Pledged as Collateral with Right Asset Pledged as Collateral with Right [Member] Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Entity Public Float Entity Public Float Liabilities, Amounts Offset Against Collateral LiabilitiesAmountOffsetAgainstCollateral LiabilitiesAmountOffsetAgainstCollateral Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification - ASU 2015-03 New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification - ASU 2015-03 [Line Items] Commitments and Contingencies [Line Items] Loss Contingencies [Line Items] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Held-to-maturity Securities, in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Federal Home Loan Bank, Advances, Fixed Rate Federal Home Loan Bank, Advances, Fixed Rate Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Four Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Four Securities purchased under agreements to resell (Notes 8, 9 and 12) Securities Purchased under Agreements to Resell Securities Purchased under Agreements to Resell Schedule of Short-term and Long-term Debt [Table] Schedule of Short-term and Long-term Debt [Table] Schedule of Short-term and Long-term Debt [Table] Mortgage Loans on Real Estate [Line Items] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] Mortgage Backed Securities [Member] Collateralized Mortgage-Backed Securities [Member] Financing Receivables [Text Block] Financing Receivables [Text Block] Net decrease in advances NetProceeds(Payments)ForFederalHomeLoanBankAdvances NetProceeds(Payments)ForFederalHomeLoanBankAdvances Customer Securities for which Entity has Right to Sell or Repledge, Securities Type [Domain] Customer Securities for which Entity has Right to Sell or Repledge, Securities Type [Domain] Reclassifications from accumulated other comprehensive income (loss) to net income Reclassifications from accumulated other comprehensive income (loss) to net income [Abstract] Reclassifications from accumulated other comprehensive income (loss) to net income [Abstract] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Repurchase/redemption of capital stock, shares Stock Repurchased During Period, Shares Net gains (losses) on trading securities Debt Securities, Trading, Gain (Loss) Proceeds from maturities of trading securities Proceeds from Maturity, Repayment, and Call, Debt Security, Trading, Held-for-Investment Debt Instrument Redemption [Table] Debt Instrument Redemption [Table] Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two Advances by Interest Rate Payment Terms [Line Items] Advances by Interest Rate Payment Terms [Line Items] [Line Items] for Advances by Interest Rate Payment Terms [Table] Statement [Line Items] Statement [Line Items] Hedged Asset, Fair Value Hedge Hedged Asset, Fair Value Hedge Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Total Class B Capital Stock Common Stock, Other Value, Outstanding Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Long-term Debt Callable or Non-Callable [Table] Long-term Debt Callable or Non-Callable [Table] Long-term Debt Callable or Non-Callable [Table] Statistical Measurement [Domain] Statistical Measurement [Domain] Short-term Debt, Fair Value Short-Term Debt, Fair Value Long-term Debt, Weighted Average Interest Rate, at Point in Time Long-Term Debt, Weighted Average Interest Rate, at Point in Time Real Estate [Domain] Real Estate [Domain] Debt Securities, Available-for-sale, Restricted Debt Securities, Available-for-Sale, Restricted Interest Rate Swap [Member] Interest Rate Swap [Member] NET INCOME NET INCOME Net Income (Loss) Attributable to Parent, Net of Federal Home Loan Bank Assessments Government Loan [Member] Government Loan [Member] Loans insured or guaranteed by a government agency, such as the Federal Housing Administration (FHA), the U.S. Department of Veterans Affairs (VA), the Rural Housing Service of the U.S. Department of Agriculture (RHS), or the U.S. Department of Housing and Urban Development (HUD). Stock dividends issued Dividends, Stock Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] AOCICashFlowsHedging [Member] AOCICashFlowsHedging US Treasury Bill Securities [Member] US Treasury Bill Securities [Member] Federal Home Loan Bank, Leverage Capital, Required Federal Home Loan Bank, Leverage Capital, Required Securities Purchased under Agreements to Resell, Gross Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, before Offset Mortgage Loans Held For Portfolio [Table Text Block] Mortgage Loans Held For Portfolio [Table Text Block] Tabular disclosure of mortgage loans held for portfolio (can include unpaid principal balance, premiums, discounts, deferred loan costs and hedging adjustments). Decrease in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Deposits, Fair Value Disclosure Deposits, Fair Value Disclosure Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Partial recovery of prior capital distribution to Financing Corporation (Note 14) PartialRecoveryofPriorCapitalDistributionToFinancingCorporation PartialRecoveryofPriorCapitalDistributionToFinancingCorporation Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_SBB AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_SBB [Table Text Block] AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_SBB Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Securities Purchased under Agreements to Resell, Amount Offset Against Collateral Security Purchased under Agreement to Resell, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Trading securities (Notes 3, 8, 12 and 16) ($347,962 and $115,077 pledged at March 31, 2026 and December 31, 2025, respectively, of which $206,939 and $0, respectively, could be rehypothecated) Trading securities Debt Securities, Trading, and Equity Securities, FV-NI Schedule of Federal Home Loan Bank Advances by Interest Rate Payment Terms [Table Text Block] Schedule of Federal Home Loan Bank Advances by Interest Rate Payment Terms [Table Text Block] The entire disclosure for mortgage loans on real estate, this includes the supplemental information pertaining to each mortgage loan receivable that equals or exceeds three percent of the carrying amount of mortgages. Securities Sold under Agreements to Repurchase, Fair Value of Collateral Securities Sold under Agreements to Repurchase, Fair Value of Collateral Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Payments for Federal Home Loan Bank Loans Payments for Federal Home Loan Bank Loans Payments for Federal Home Loan Bank Loans Hedging Designation [Domain] Hedging Designation [Domain] Financing Receivable, Accrued Interest, after Allowance for Credit Loss Financing Receivable, Accrued Interest, after Allowance for Credit Loss TOTAL LIABILITIES AND CAPITAL Liabilities and Equity Offsetting Assets, Gross Offsetting Assets, Gross Amount, before effects of master netting arrangements, of assets subject to master netting arrangements. Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Fees paid on prepaid Advances with Symmetrical Prepayment Feature Fees Paid on Prepaid Advances with Symmetrical Prepayment Fees paid on Prepaid Advances with Symmetrical Prepayment Feature Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Debt Securities, Trading, Restricted Trading securities pledged which could not be rehypothecated) Trading securities pledged which could not be rehypothecated) Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] Available-for-Sale Securities [Member] Capital [Table] Capital [Table] Capital [Table] Minimum Stock Surplus Required For Repurchase Minimum Stock Surplus Required For Repurchase Minimum Stock Surplus Required For Repurchase Federal funds sold Interest Income, Federal Funds Sold Capital stock Stockholders' Equity, Number of Shares, Par Value and Other Disclosure [Abstract] Derivative, Collateral, Obligation to Return Securities Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Forward Contracts [Member] Forward Contracts [Member] Proceeds from sales of trading securities Proceeds from Sale, Debt Security, Trading, and Equity Security, FV-NI, Held-for-Investment Pay vs Performance Disclosure [Line Items] 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] FHL Bank of Dallas [Member] FHL Bank of Dallas [Member] FHL Bank of Dallas [Member] US Government Agencies Debt Securities [Member] US Government Agencies Debt Securities [Member] Mortgage Receivable [Member] Mortgage Receivable [Member] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Liabilities [Abstract] Liabilities [Abstract] Transactions with Other FHLBanks Transactions with Other FHLBanks [Text Block] Transactions with other FHLBanks [Text Block] FHLB of Boston [Member] Federal Home Loan Bank of Boston [Member] Accounting Standards Update 2016-02 [Member] Accounting Standards Update 2016-02 [Member] Chargeoffs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) Federal Home Loan Bank advances, par value u.s. gaap - Federal Home Loan Bank advances, par value u.s. gaap - Federal Home Loan Bank advances, par value Step Up [Member] Step Up [Member] Step Up [Member] Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Federal Home Loan Bank of Pittsburgh Federal Home Loan Bank of Pittsburgh [Member] Company Selected Measure Amount Company Selected Measure Amount Name Measure Name Federal Home Loan Bank, Advances, Maturities Summary, in Next Rolling Twelve Months Federal Home Loan Bank, Advances, Maturities Summary, in Next Rolling 12 Months Net increase in deposit liabilities, including swap collateral held Increase (Decrease) in Deposits Principal collected on available-for-sale securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Total other comprehensive income (loss) Total other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Basis of Presentation [Abstract] Basis of Presentation [Abstract] Basis of Presentation [Abstract] Unsecured Debt [Member] Unsecured Debt [Member] Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Five Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Five Available-for-sale Securities, Debt Maturities [Abstract] Available-for-Sale Securities, Debt Maturities [Abstract] FHLBanks [Member] FHLBanks [Member] Represents all 12 Federal Home Loan Banks [Member] Legal Entity [Axis] Legal Entity [Axis] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document and Entity Information [Abstract] TOTAL ASSETS Assets Federal Home Loan Bank, Advances [Text Block] Federal Home Loan Bank, Advances [Text Block] US Government Agency Insured Loans [Member] US Government Agency Insured Loans [Member] Net transfers of shares between between Class B-1 and Class B-2 Stock, shares Net Transfers During Period Between Classes of Stock, Shares Net Transfers During Period Between Classes of Stock, Shares Non-member Counterparty [Member] Non-member Counterparty [Member] Non-member Counterparty [Member] Proceeds from Sale of Held-To-Maturity Securities fhlbdProceeds from Sale of Held-To-Maturity Securities fhlbdProceeds from Sale of Held-To-Maturity Securities Allowance for Credit Losses [Abstract] Allowance for Credit Losses [Abstract] Allowance for Credit Losses [Abstract] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Receivable Type [Axis] Receivable Type [Axis] Offsetting Liabilities, Total OffsettingLiabilitiesTotal OffsettingLiabilitiesTotal Federal Home Loan Bank Advances Receivable [Member] Federal Home Loan Bank Advances Receivable [Member] Federal Home Loan Bank Advances Receivable Consolidated Obligations by Contractual Maturity or Next Call Date [Line Items] Consolidated Obligations by Contractual Maturity or Next Call Date [Line Items] [Line Items] for Consolidated Obligations by Contractual Maturity or Next Call Date [Table] Non-cash interest on mandatorily redeemable capital stock Other Noncash Expense RepurchasedSurplusStockMRCSPortion RepurchasedSurplusStockMRCSPortion RepurchasedSurplusStockMRCSPortion Debt Securities, Held-to-maturity [Abstract] Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Held-to-maturity securities, Fair Value Debt Securities, Held-to-maturity, Fair Value Debt Securities, Held-to-maturity, Fair Value Debt Securities, Held-to-Maturity, Fair Value Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Long-term Debt, Maturities, Repayments of Principal in Year Five, Weighted Average Interest Rate Long-term Debt, Maturities, Repayments of Principal in Year Five, Weighted Average Interest Rate Long-term Debt, Maturities, Repayments of Principal in Year Five, Weighted Average Interest Rate Right-of-use assets acquired by lease Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Dividends on capital stock Dividends On Capital Stock At Percent Annualized Rate Abstract Dividends On Capital Stock At Percent Annualized Rate Abstract -- None. No documentation exists for this element. -- Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Basis of Accounting [Text Block] Basis of Accounting [Text Block] Canopy Loans Canopy Loans Canopy Loans PEO PEO [Member] Debt Securities, Trading Debt Securities, Trading Investments Classified by Contractual Maturity Date [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three Long-Term Debt, Maturities, Repayments of Principal in Rolling Year Three fhlbd_ConventionalMortgageLoans ModifiedUnderCARESAct fhlbd_ConventionalLoansModifiedUndertheCARESAct [Member] fhlbd_ConventionalLoansModifiedUndertheCARESAct Comerica Bank Comerica Bank [Member] Comerica Bank HedgedAssetActiveFairValueHedgeCumulativeIncreaseDecrease HedgedAssetActiveFairValueHedgeCumulativeIncreaseDecrease HedgedAssetActiveFairValueHedgeCumulativeIncreaseDecrease Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Federal Home Loan Bank, Advances, Floating Rate Federal Home Loan Bank, Advances, Floating Rate Retained Earnings Retained Earnings [Member] Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Derivative assets (Notes 12 and 13) Derivative Assets Derivative assets Derivative Asset Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Not Designated as Hedging Instrument, Economic Hedge [Member] Not Designated as Hedging Instrument, Economic Hedge [Member] Interest Expense [Member] Interest Expense [Member] Schedule of Other Transactions by Counterparty [Domain] Schedule of Other Transactions by Counterparty [Domain] Schedule of Other Transactions by Counterparty [Domain] Increase (decrease) in accrued interest payable Increase (Decrease) in Interest Payable, Net Debt Securities, Available-for-sale [Abstract] Debt Securities, Available-for-Sale [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Parent Parent [Member] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Derivative, Notional Amount Derivative, Notional Amount Variable Interest Rate [Member] Variable Interest Rate [Member] Financial instruments with a variable rate of interest. City Area Code City Area Code Federal Home Loan Bank, Advances, Floating Rate, under One Year Federal Home Loan Bank, Advance, Floating Rate, Year One Statement of Condition [Abstract] Statement of Condition [Abstract] Statement of Condition [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Mortgages [Member] Mortgages [Member] Counterparty exposure [Member] Basis Swap [Member] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] AHP Voluntary Contribution Voluntary Grants and Donations Voluntary Grants and Donations Accrued interest receivable (Note 8) Accrued interest receivable Interest Receivable Schedule of Loans from Other Federal Home Loan Banks [Table Text Block] Schedule of Loans from Other Federal Home Loan Banks [Table Text Block] Schedule of Loans from Other Federal Home Loan Banks [Table Text Block] Amortization of net actuarial gain Defined Benefit Plan, Amortization of Gain (Loss) Other liabilities (Note 4) Other Liabilities Earlier of Contractual Maturity or Next Call Date [Member] Earlier of Contractual Maturity or Next Call Date [Member] Earlier of Contractual Maturity or Next Call Date [Member] Accrued Interest Receivable [Abstract] Accrued Interest Receivable [Abstract] Accrued Interest Receivable [Abstract] Financing Receivable, Net Deferred Loan Costs Financing Receivable, Net Deferred Loan Costs Reflects the cumulative amount of deferred loan costs and fees that are being amortized into income as an adjustment to yield. Real Estate Loan [Member] Real Estate Loan [Member] Deposits (including $38 of non-interest bearing deposits at March 31, 2026 and December 31, 2025) Deposits, Domestic Net increase in interest-bearing deposits, including swap collateral pledged Proceeds from (Payments for) in Interest-Bearing Deposits in Banks Supplemental Disclosures: Supplemental Cash Flow Information [Abstract] Debt Securities, Available-for-sale, Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Other Performance Measure, Amount Other Performance Measure, Amount Weighted Average Interest Rate on Overdrawn Demand Deposit Weighted Average Interest Rate on Overdrawn Demand Deposit US government agency and GSE mortgage-backed securities[Member] US Treasury and Government [Member] Debt issuance costs Payments of Debt Issuance Costs Federal Home Loan Bank, Advances, Commitment Fees Federal Home Loan Bank, Advances, Commitment Fees Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Right-of-use assets and lease liabilities due to the adoption of ASU2016-02 Right-of-use assets and lease liabilities due to the adoption of ASU2016-02 Right-of-use assets and lease liabilities due to the adoption of ASU2016-02 Stock Stock Issued During Period, Value, Stock Dividend Entity [Domain] Entity [Domain] Net cash provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation 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] Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Loans Insured or Guaranteed by Government Authorities [Axis] Loans Insured or Guaranteed by Government Authorities [Axis] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Four Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Four Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three Carrying Value [Member} Reported Value Measurement [Member] Securities purchased under agreements to resell Interest Income, Securities Purchased under Agreements to Resell Non-accrual loans Financing Receivable, Nonaccrual Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss Derivatives, Policy [Policy Text Block] Derivatives, Policy [Policy Text Block] Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Trading [Member] US Treasury Securities [Member] HedgedLiabilityActiveFairValueHedgeCumulativeIncreaseDecrease HedgedLiabilityActiveFairValueHedgeCumulativeIncreaseDecrease HedgedLiabilityActiveFairValueHedgeCumulativeIncreaseDecrease Offsetting Liabilities, Collateral Not Offset In the Statement of Condition OffsettingLiabilitiesCollateralNotOffsetInStatementOfCondition OffsettingLiabilitiesCollateralNotOffsetInStatementOfCondition Troubled Debt Restructuring Relief [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Step Up/ Step Down [Member] Step Up/ Step Down [Member] Step Up/ Step Down [Member] Schedule of Net Benefit Costs [Table Text Block] Schedule of Net Benefit Costs [Table Text Block] Other Debt Obligations [Member] Other Debt Obligations [Member] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Federal Home Loan Bank, Advances [Table Text Block] Federal Home Loan Bank, Advances [Table Text Block] Comprehensive Income (Loss) Note [Text Block] Comprehensive Income (Loss) Note [Text Block] 2020 Special Advance Offering, Maximum Balance 2020 Special Advance Offering, Maximum Balance 2020 Special Advance Offering, Maximum Balance Loans to other FHLBanks, Beginning of period Loans to other FHLBanks, End of period Loans to Other Federal Home Loan Banks Membership Investment Requirement, Minimum Dollar Amount MembershipInvestmentRequirementMinimumDollarAmount MembershipInvestmentRequirementMinimumDollarAmount Prepayment fees on advances, net Prepayment Fees on Advances, Net Repurchase/redemption of capital stock Stock Repurchased During Period, Value Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Nonperforming Financial Instruments [Member] Nonperforming Financial Instruments [Member] Discount Notes [Member] Discount Notes [Member] Discount Notes [Member] Retained Earnings, Unrestricted Retained Earnings, Unappropriated [Member] Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Obligation with Joint and Several Liability Arrangement, Amount Recognized Obligation with Joint and Several Liability Arrangement, Amount Recognized Adjustments for Change in Accounting Principle [Axis] Change in Accounting Principle, Type [Axis] Arrangement Duration Trading Arrangement Duration Debt Securities, Trading, and Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Adjustments for Change in Accounting Principle [Domain] Change in Accounting Principle, Type [Domain] Increase (decrease) in Affordable Housing Program (AHP) liability Increase Decrease In Affordable Housing Program Liability Decrease in Affordable Housing Program (AHP) liability Derivative Asset, Fair Value, Amount Offset Against Collateral DerivativeAssetCollateralObligationToReturnReclaimCashOffset DerivativeAssetCollateralObligationToReturnReclaimCashOffset Advances Funded Under Special Advances Program Remaining Balance Advances Funded Under Special Advances Program Remaining Balance Advances Funded Under Special Advances Program Remaining Balance Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Proceeds from Federal Home Loan Bank Loans Proceeds from Federal Home Loan Bank Loans Proceeds from Federal Home Loan Bank Loans ASSETS Assets [Abstract] Other Contract [Member] Other Contract [Member] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument, Redemption [Line Items] Debt Instrument, Redemption [Line Items] Debt Instrument [Axis] Debt Instrument [Axis] AOCI Attributable to Parent [Abstract] Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Fair Value Disclosures Fair Value Disclosures [Text Block] Pension and Other Postretirement Benefits Disclosure [Text Block] Retirement Benefits [Text Block] Gains on early extinguishment of debt Gain (Loss) on Extinguishment of Debt CAPITAL (Note 14) Equity, Attributable to Parent [Abstract] Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax Financial Asset, 30 to 59 Days Past Due [Member] Financial Asset, 30 to 59 Days Past Due [Member] Activity Based % Requirement, Special Advances Program 2020 Modification Activity Based % Requirement, Special Advances Program 2020 Modification Activity Based % Requirement, Special Advances Program 2020 Modification Entity Voluntary Filers Entity Voluntary Filers Schedule of Other Transactions by Counterparty [Axis] Schedule of Other Transactions by Counterparty [Axis] Schedule of Other Transactions by Counterparty [Axis] Transactions with Other FHLBanks [Abstract] Transactions with Other FHLBanks [Abstract] Transactions with Other FHLBanks [Abstract] Federal Funds Sold [Member] Federal Funds Sold [Member] Federal Funds Sold [Member] Held-to-maturity Securities, Debt Maturities, After Five Through Ten Years, Net Carrying Amount Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Activity Based % Requirement, Special Advances Program Activity Based % Requirement, Special Advances Program Activity Based % Requirement, Special Advances Program Derivative Asset, Fair Value, Gross Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Retained Earnings, Restricted Retained Earnings, Appropriated [Member] Financing Receivable, Unamortized Premiums Financing Receivable, Unamortized Premiums Reflects the cumulative amount of premiums over the face amount of loans that are being amortized into income as an adjustment to yield Held-to-maturity securities Interest Income, Debt Securities, Held-to-Maturity Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Fifteen Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Fifteen Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Fifteen Entity Registrant Name Entity Registrant Name Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic benefit credit Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Unrestricted Retained Earnings, Unappropriated Gross Prepayment Fees on Advances Received Prepayment Fees on Advances Received Prepayment Fees on Advances Received Advances by Redemption Terms [Line Items] Advances by Redemption Terms [Line Items] [Line Items] for Advances by Redemption Terms Other borrowings Interest Expense, Other Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two Long-Term Debt, Maturities, Repayments of Principal in Rolling Year Two Federal Home Loan Bank Advances, Fair Value Disclosure Federal Home Loan Bank Advances, Fair Value Disclosure Federal Home Loan Bank Advances, Fair Value Disclosure Interest Expense, Loans from Other Federal Home Loan Banks Interest Expense, Loans from Other Federal Home Loan Banks Schedule of Other Transactions, Counterparty [Domain] Schedule of Other Transactions, Counterparty [Domain] Schedule of Other Transactions, Counterparty [Domain] Federal funds sold (Notes 8 and 9) Federal Funds Sold Restatement [Domain] Revision of Prior Period [Domain] Schedule of Other Transactions [Table] Schedule of Other Transactions [Table] Schedule of Other Transactions [Table] Offsetting Assets, Amount Not Offset Against Collateral Offsetting Assets, Amount Not Offset Against Collateral Offsetting Assets, Amount Not Offset Against Collateral Net premiums and discounts on advances, consolidated obligations, investments and mortgage loans Accretion (Amortization) of Discounts and Premiums, Investments Interest cost Defined Benefit Plan, Interest Cost Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Federal Home Loan Bank, Advances, Maturities Summary in Rolling Year Six Through Rolling Year Fifteen Federal Home Loan Bank, Advances, Maturities Summary in Rolling Year Six Through Rolling Year Fifteen Federal Home Loan Bank, Advances, Maturities Summary in Rolling Year Six Through Rolling Year Fifteen Consolidated Obligations by Contractual Maturity or Next Call Date [Table] Consolidated Obligations by Contractual Maturity or Next Call Date [Table] Consolidated Obligations by Contractual Maturity or Next Call Date [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Activity Based Investment Requirement, Percent of Outstanding Advances Activity Based Investment Requirement, Percent of Outstanding Advances Activity Based Investment Requirement, Percent of Outstanding Advances Canopy Loan Canopy Loan [Member] Canopy Loan Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Amortized Cost Name Trading Arrangement, Individual Name Variable Rate SOFR Variable Rate SOFR [Member] Variable Rate SOFR Total consolidated obligations Federal Home Loan Bank, Consolidated Obligations Schedule of Short-term Debt [Table] Short-Term Debt [Table] Debt Instrument, Face Amount Debt Instrument, Face Amount Federal Home Loan Bank, Advances, Fixed Rate, after One Year Federal Home Loan Bank, Advance, Fixed Rate, after Year One Payments for redemption of mandatorily redeemable capital stock Repayments of Mandatory Redeemable Capital Securities Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Name Awards Close in Time to MNPI Disclosures, Individual Name Contractual Maturity [Member] Contractual Maturity [Member] Contractual Maturity [Member] Federal Home Loan Bank, Regulatory Capital, Actual Federal Home Loan Bank, Regulatory Capital, Actual Banks [Domain] Banks [Domain] Banks [Domain] Held-to-maturity Securities, Debt Maturities, After One Through Five Years, Net Carrying Amount Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Membership Investment Requirement, Percent of Members Total Assets as of Previous Calendar Year Membership Investment Requirement, Percent of Members Total Assets as of Previous Calendar Year Membership Investment Requirement, Percent of Members Total Assets as of Previous Calendar Year Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Discount notes Proceeds from Other Short-Term Debt FHLBank of Indianapolis [Member] Federal Home Loan Bank of Indianapolis [Member] Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five Long-Term Debt, Maturities, Repayments of Principal in Rolling after Year Five Shares reclassified to mandatorily redeemable capital stock Net capital stock reclassified to mandatorily redeemable capital stock Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value Realized gains on sales of held-to-maturity securities Debt Securities, Held-to-Maturity, Sold, Realized Gain (Loss) Accumulated other comprehensive income (Note 19) Accumulated Other Comprehensive Income (Loss), before Federal Home Loan Bank Assessments Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Discount notes Federal Home Loan Bank, Consolidated Obligations, Discount Notes Federal Home Loan Bank, Consolidated Obligations, Discount Notes Restricted Retained Earnings, Appropriated Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Offsetting Assets and Liabilities [Table Text Block] Offsetting Assets and Liabilities [Table Text Block] [Table Text Block] for Tabular disclosure of derivative and other financial assets and liabilities that are subject to offsetting, including master netting arrangements. Securities Purchased under Agreements to Resell, Amount Not Offset Against Collateral Securities Purchased under Agreements to Resell, Amount Not Offset Against Collateral Amount of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price elected not to be offset against an obligation to return collateral under a master netting arrangement. Hedged Item Type [Domain] Hedged Item Type [Domain] Hedged Item Type [Domain] Accumulated Net Unrealized Investment Gain (Loss) [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] INTEREST EXPENSE Interest Expense, Operating and Nonoperating [Abstract] Derivative Liability, Fair Value, Gross Asset Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Purchases of available-for-sale securities Payments to Acquire Debt Securities, Available-for-Sale TOTAL COMPREHENSIVE INCOME Comprehensive income (loss) Comprehensive Income (Loss), Net of Federal Home Loan Bank Assessments, Attributable to Parent US States and Political Subdivisions Debt Securities [Member] US States and Political Subdivisions Debt Securities [Member] Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] Accrued interest payable Interest Payable Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] All Executive Categories All Executive Categories [Member] Federal Home Loan Bank, Advances, Maturities Summary, after Rolling Year Fifteen Federal Home Loan Bank, Advances, Maturities Summary, after Rolling Year Fifteen Federal Home Loan Bank, Advances, Maturities Summary, after Rolling Year Fifteen Long-term Debt Callable or Non-Callable [Line Items] Long-term Debt Callable or Non-Callable [Line Items] [Line Items] for Long-term Debt Callable or Non-Callable [Table] Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Mortgage loans held for portfolio Interest and Fee Income, Loans, Consumer, Real Estate Trading securities Interest Income, Debt Securities, Trading, Operating Commitments and contingencies (Notes 9 and 17) Commitments and Contingencies The increase (decrease) in other income and decrease (increase) in net interest income due to the adoption of ASU2017-12 The increase (decrease) in other income and decrease (increase) in net interest income due to the adoption of ASU2017-12 The increase (decrease) in other income and decrease (increase) in net interest income due to the adoption of ASU2017-12 Exchange Cleared [Member] Exchange Cleared [Member] New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Interest Income [Member] Interest Income [Member] Mortgage Loans in Process of Foreclosure, Amount Mortgage Loans in Process of Foreclosure, Amount New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Accounting Standards Update and Change in Accounting Principle [Text Block] Short-term Debt [Line Items] Short-Term Debt [Line Items] Loans and Leases Receivable, Unpaid Principal Balance Loans and Leases Receivable, Unpaid Principal Balance Reflects the aggregate unpaid principal balance of all categories of loans and leases held in portfolio Repurchased Surplus Stock, Total RepurchasedSurplusStockTotal RepurchasedSurplusStockTotal Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Hedged Liability, Fair Value Hedge Hedged Liability, Fair Value Hedge Financial Asset, 60 to 89 Days Past Due [Member] Financial Asset, 60 to 89 Days Past Due [Member] Hedging Designation [Axis] Hedging Designation [Axis] Other Other Interest and Dividend Income Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Discount notes Interest Expense, Other Short-term Borrowings Interest Expense, Other Short-Term Borrowings Statement, Scenario [Axis] Scenario [Axis] Scenario [Axis] Interest-bearing Deposits, Fair Value Disclosure Interest-bearing Deposits, Fair Value Disclosure Interest-bearing Deposits, Fair Value Disclosure Derivative Liability, Fair Value, Amount Not Offset Against Collateral Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Derivative Liabilities, Non-Cash, Collateral Pledged to Counterparties Derivative, Collateral, Right to Reclaim Securities That Can Be Sold or Repledged mount of right to reclaim securities collateral that can be sold or repledged under master netting arrangements that have not been offset against derivative liabilities. Derivative Contract Type [Domain] Derivative Contract [Domain] Derivative Contract [Domain] Reclassification adjustment for gains on cash flow hedges included in net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Proceeds from issuance of capital stock Proceeds from Issuance of Common Stock Interest Rate Swaptions Related to Optional Advance Commitments [Member] Interest Rate Swaptions Related to Optional Advance Commitments [Member] Interest Rate Swaptions Related to Optional Advance Commitments [Member] Deferred Prepayment Fees Deferred Prepayment Fees on Advances Deferred Prepayment Fees on Advances All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Netting Adjustment Asset Netting Adjustment Asset Netting Adjustment Asset Name Forgone Recovery, Individual Name Net change in derivative and hedging activities Unrealized Gain (Loss) on Derivatives Federal Home Loan Bank Advances Option [Axis] Federal Home Loan Bank, Advances, Option [Axis] 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] Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2029 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2029 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2029 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2027 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2027 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2027 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2028 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2028 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2028 Debt Valuation Adjustment for Hedging Activities Debt Valuation Adjustment for Hedging Activities Debt Valuation Adjustment for Hedging Activities Deposit Liabilities Reclassified as Loans Receivable Deposit Liabilities Reclassified as Loans Receivable Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2026 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2026 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2026 Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-Maturity [Table] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Proceeds from sales of held-to-maturity securities Proceeds from Sale of Held-to-Maturity Securities Callable [Member] Callable [Member] Callable [Member] Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss Cumulative Basis Adjustments for Fair Value Hedges [Table Text Block] Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Transaction Type [Axis] Transaction Type [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] AHP payments, net Grants funded, net of recaptured amounts Payments for Affordable Housing Programs Office of Finance Office of Finance, Cost Assessed on Federal Home Loan Bank FHLB of San Francisco [Member] Federal Home Loan Bank of San Francisco [Member] Derivatives, Embedded Derivatives [Policy Text Block] Derivatives, Embedded Derivatives [Policy Text Block] Forecast Forecast [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Affordable Housing Program [Roll Forward] Affordable Housing Program [Roll Forward] Provision (reversal) for credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Mortgage Loans on Real Estate Schedule [Table] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Schedule [Table] Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2030 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2030 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2030 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2031 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2031 Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring in 2031 Net Gain (Loss) on Cash Flow Hedging Relationship Net Gain Loss on Cash Flow Hedging Relationship Net Gain Loss on Cash Flow Hedging Relationship Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Interest payments applied to principal on Non-Accrual Loans Interest payments applied to principal on non-accrual loans Interest payments applied to principal on non-accrual loans Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four Long-Term Debt, Maturities, Repayments of Principal in Rolling Year Four Institutions affiliated with American General Life Insurance Company Institutions affiliated with American General Life Insurance Company [Member] Institutions affiliated with American General Life Insurance Company ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock [Line Items] ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock [Line Items] [Line Items] for ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock [Table] Gain (Loss) on Fair Value Hedges Recognized in Earnings Gain (Loss) on Fair Value Hedges Recognized in Earnings Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Federal Home Loan Bank Advances, Valuation Adjustments For Hedging Activities Federal Home Loan Bank, Advances, Valuation Adjustments for Hedging Activities Simmons Bank Simmons Bank [Member] Simmons Bank AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_Canopy AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_Canopy [Table Text Block] AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_Canopy Long-term Debt, Maturities, Repayments of Principal in Year Three, Weighted Average Interest Rate Long-term Debt, Maturities, Repayments of Principal in Year Three, Weighted Average Interest Rate Long-term Debt, Maturities, Repayments of Principal in Year Three, Weighted Average Interest Rate Long-term Debt By Maturity Type [Axis] Long-term Debt By Maturity Type [Axis] Long-term Debt By Maturity Type [Axis] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] percentage of outstanding advances outstanding advances to borrowers, percentage outstanding advances to borrowers, percentage Non Callable [Member] Non Callable [Member] Non Callable [Member] Other amounts of other comprehensive income (loss) Other amounts of other comprehensive income (loss) [Abstract] Other amounts of other comprehensive income (loss) [Abstract] Award Timing Disclosures [Line Items] Class B-1 Stock [Member] Class B-1 Stock [Member] Common Class B-1 Stock [Member] Consolidated Obligation Discount Notes [Member] Consolidated Obligation Discount Notes [Member] Amount of joint and several obligations consisting of discount notes issued by Federal Home Loan Banks (FHLBanks). Securities purchased under agreements to resell (Notes 8, 9 and 12) Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Service cost Defined Benefit Plan, Service Cost Federal Home Loan Banks [Abstract] Federal Home Loan Banks [Abstract] Bonds Proceeds from Issuance of Other Long-Term Debt Stockholders' Equity Note Disclosure [Text Block] Equity [Text Block] Mortgage Loans On Real Estate, Original Contractual Terms Mortgage Loans On Real Estate, Original Contractual Terms Mortgage Loans On Real Estate, Original Contractual Terms, Medium-Term Loan Variable Rate LIBOR Variable Rate LIBOR [Member] Variable Rate LIBOR Mortgage loans held for portfolio, net of allowance for credit losses of $8,673 and $8,554 at March 31, 2026 and December 31, 2025, respectively (Notes 7, 8 and 9) Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Offsetting Liabilities, Amount Not Offset Against Collateral OffsettingLiabilitiesAmountNotOffsetAgainstCollateral OffsettingLiabilitiesAmountNotOffsetAgainstCollateral Accrued Interest Receivable [Table Text Block] AccruedInterestReceivable [Table Text Block] [Table Text Block] for AccruedInterestReceivable [Table] Payments for repurchase/redemption of capital stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Transactions with Shareholders [Abstract] Transactions with Shareholders [Abstract] Transactions with Shareholders [Abstract] Charles Schwab Premier Bank Charles Schwab Premier Bank [Member] Charles Schwab Premier Bank Interest-bearing Deposits [Member] Interest-Bearing Deposits [Member] USAA Federal Savings Bank USAA Federal Savings Bank [Member] USAA Federal Savings Bank Federal Home Loan Bank Advances, Interest Rate Federal Home Loan Bank, Advances, Interest Rate Capital Unit [Line Items] Capital Unit [Line Items] Total retained earnings Retained Earnings (Accumulated Deficit) 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] Non-mortgage-backed securities [Member] 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. Hedged Item Type [Axis] Hedged Item Type [Axis] Hedged Item Type [Axis] Activity Based Investment Requirement, Percent of Outstanding Advances 2021 Modification Activity Based Investment Requirement, Percent of Outstanding Advances 2021 Modification Activity Based Investment Requirement, Percent of Outstanding Advances 2021 Modification Purchases of held-to-maturity securities Payments to Acquire Held-to-Maturity Securities Class of Stock [Axis] Class of Stock [Axis] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Advances by Interest Rate Payment Terms [Table] Advances by Interest Rate Payment Terms [Table] Advances by Interest Rate Payment Terms [Table] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Activity Based Investment Requirement, Reduced Percentage, Funded Advance Programs Activity Based Investment Requirement, Reduced Percentage, Funded Advance Programs Activity Based Investment Requirement, Reduced Percentage, Funded Advance Programs 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] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Statement [Table] Statement [Table] Adjustments to reconcile net income to net cash provided by (used in) operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Derivative Asset Fair Value Cash Received or Remitted Exceeding Variation Margin Requirement Derivative Asset Fair Value Cash Remitted Exceeding Variation Margin Requirement Derivative Asset Fair Value Cash Remitted Exceeding Variation Margin Requirement Conventional Mortgage Loan [Member] Conventional Mortgage Loan [Member] Long-term Debt By Maturity Type [Domain] Long-term Debt By Maturity Type [Domain] Long-term Debt By Maturity Type [Domain] Beginning balance, shares Ending balance, shares Shares, Issued Net losses (gains) on trading securities Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI Consolidated obligations Interest Expense, Borrowings [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Loans Receivable With Fixed Rates Of Interest Medium Term [Member] 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 [Member] Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss Other Postretirement Benefit Plans, Defined Benefit [Member] Other Postretirement Benefits Plan [Member] Termination Date Trading Arrangement Termination Date Interest-bearing deposits (Notes 8 and 9) Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Balance, beginning of period Balance, end of period Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Customer Securities for which Entity has Right to Sell or Repledge [Axis] Customer Securities for which Entity has Right to Sell or Repledge [Axis] Debt Instrument Call Feature [Axis] Debt Instrument Call Feature [Axis] Debt Instrument Call Feature [Axis] Receivable [Domain] Receivable [Domain] Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, due in Next Rolling Twelve Months Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Next Rolling 12 Months Interest Rate Type [Domain] Interest Rate Type [Domain] Interest Rate Type [Domain] Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement AllowanceForCreditLossesOnFinancingReceivablesTableTextBlockConventional Mortgages AllowanceForCreditLossesOnFinancingReceivablesTableTextBlockConventional Mortgages [Table Text Block] AllowanceForCreditLossesOnFinancingReceivablesTableTextBlockConventional Mortgages Activity Based Investment Requirement, Percent of Outstanding LOCs Activity Based Investment Requirement, Percent of Outstanding LOCs Activity Based Investment Requirement, Percent of Outstanding LOCs Debt Disclosure [Abstract] Debt Disclosure [Abstract] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Scenario [Domain] Scenario [Domain] Letter of credit fees Letters of Credit Fees Fee income received for providing letters of credit to members. Serious delinquency rate Loans and Leases Receivable, Serious Delinquencies Ratio Loans that are 90 days or more past due or in the process of foreclosure as a percentage of total mortgage loans outstanding. Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Net unrealized gains (losses) on available-for-sale securities, net of unrealized gains and losses relating to hedged interest rate risk included in net income Net unrealized gains (losses) on available-for-sale securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Capital stock — Class B-2 putable ($100 par value) issued and outstanding shares: 17,224,190 and 20,746,739 shares at March 31, 2026 and December 31, 2025, respectively Capital Stock Class B-2 - Activity Common Class B-2 [Member] Common Class B-2 [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share SBB Loans SBB Loans SBB Loans Charles Schwab Bank SSB Charles Schwab Bank SSB [Member] Charles Schwab Bank SSB External Credit Rating, Non Investment Grade [Member] External Credit Rating, Noninvestment Grade [Member] Derivative Asset, Fair Value, Gross Liability Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Insider Trading Arrangements [Line Items] Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Total liabilities Liabilities Bonds Bonds Federal Home Loan Bank, Consolidated Obligations, Bonds Capital stock — Class B-1 putable ($100 par value) issued and outstanding shares: 10,303,207 and 12,636,851 shares at March 31, 2026 and December 31, 2025, respectively Capital Stock - Class B-1 - Membership/Excess Common Class B-1 [Member] Common Class B-1 [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Schedule of Short-term and Long-term Debt [Line Items] Schedule of Short-term and Long-term Debt [Line Items] Schedule of Short-term and Long-term Debt [Line Items] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Domain] Unsecured loans to members included in other assets Small Business Boost and Canopy Loans, FV Disclosure Small Business Boost and Canopy Loans, FV Disclosure Derivative, Collateral, Right to Reclaim Securities Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Proceeds from sale of capital stock Stock Issued During Period, Value, New Issues Federal Home Loan Bank, Leverage Ratio, Actual Federal Home Loan Bank, Leverage Ratio, Actual Unamortized Debt Issuance Expense Unamortized Debt Issuance Expense Schedule of Capital Units [Table] Equity, Capital Unit or Share [Table] Federal Home Loan Bank, Advances, Weighted Average Interest Rate Federal Home Loan Bank, Advances, Weighted Average Interest Rate Stock Dividends, Common Stock, Stock Counterparty Name [Axis] Counterparty Name [Axis] Advances [Table] Advances [Table] Advances [Table] Collateral Thresholds Collateral Thresholds Collateral Thresholds Principal collected on held-to-maturity securities Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Available-for-sale securities (a) (Notes 4, 8, 9, 12 and 16) ($0 and $360,297 pledged at March 31, 2026 and December 31, 2025, respectively, of which $0 and $303,565, respectively, could be rehypothecated) Available-for-sale securities Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Advances [Member] Advances [Member] Advances [Member]