v3.26.1
Mortgage Loans Held for Portfolio Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage Loans in Process of Foreclosure, Amount [1] $ 11,101 $ 6,290
Mortgage loans held for portfolio, net    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss [2] 5,478,693 5,222,777
Financing Receivable, 90 Days or More Past Due, Still Accruing 1,742 1,693
Financing Receivable, Excluding Accrued Interest, Nonaccrual 25,904 24,074
Government-guaranteed/insured loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage Loans in Process of Foreclosure, Amount [1] 541 393
Government-guaranteed/insured loans | Mortgage loans held for portfolio, net    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, 90 Days or More Past Due, Still Accruing 1,742 1,693
Financing Receivable, Excluding Accrued Interest, Nonaccrual 0 0
Conventional MPF Loan [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years [3] 2,411,762 3,002,414
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss [3] 5,396,459 5,136,949
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year [3] 2,984,697 2,134,535
Mortgage Loans in Process of Foreclosure, Amount [1] 10,560 5,897
Conventional MPF Loan [Member] | Nonperforming Financial Instruments [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 59,684  
Conventional MPF Loan [Member] | Mortgage loans held for portfolio, net    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, 90 Days or More Past Due, Still Accruing 0 0
Financing Receivable, Excluding Accrued Interest, Nonaccrual 25,904 24,074
Financial Asset, 30 to 59 Days Past Due [Member] | Conventional MPF Loan [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years 13,218 29,782
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 48,544 65,499
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 35,326 35,717
Financial Asset, 60 to 89 Days Past Due [Member] | Conventional MPF Loan [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years 6,725 8,636
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 15,779 18,005
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year $ 9,054 $ 9,369
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Mortgage loans held for portfolio, net    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Percent Past Due [4] 0.40% 0.40%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Government-guaranteed/insured loans | Mortgage loans held for portfolio, net    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Percent Past Due [4] 2.10% 2.00%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Conventional MPF Loan [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years $ 6,854 $ 8,675
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 22,158 20,358
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year $ 15,304 $ 11,683
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Conventional MPF Loan [Member] | Mortgage loans held for portfolio, net    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Percent Past Due [4] 0.40% 0.40%
Financial Asset, Past Due | Conventional MPF Loan [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years $ 26,797 $ 47,093
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 86,481 103,862
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   56,769
Financial Asset, Not Past Due | Conventional MPF Loan [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years 2,384,965 2,955,321
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 5,309,978 5,033,087
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year $ 2,925,013 $ 2,077,766
[1] Includes loans where the decision of foreclosure or similar alternative such as pursuit of deed-in-lieu has been reported. Loans in process of foreclosure are included in past due or current loans dependent on their delinquency status.
[2] Amounts exclude accrued interest receivable of $35.8 million at June 30, 2026 and $33.6 million at December 31, 2025
[3] The amortized cost at June 30, 2026 and December 31, 2025 excludes accrued interest receivable.
[4] Loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total loan portfolio class.