v3.25.3
Mortgage Loans Held for Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Mortgage Loans held for portfolio [Line Items]            
Accrued Interest - Mortgage loans held for portfolio $ 5,187,822   $ 4,816,452      
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable   Accrued interest receivable      
Government-guaranteed/insured loans            
Mortgage Loans held for portfolio [Line Items]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process $ 85,892   $ 92,317      
Conventional MPF Loan [Member]            
Mortgage Loans held for portfolio [Line Items]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss [1] 5,102,471   4,724,665      
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year [1] 2,190,615   1,483,228      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 5,055,478   4,677,261      
Mortgage loans held for portfolio, net            
Mortgage Loans held for portfolio [Line Items]            
Premiums 73,271   66,974      
Discounts (12,144)   (12,239)      
Hedging adjustments (12,443)   (5,432)      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss [2] 5,190,054   4,818,881      
Allowance for credit losses on mortgage loans (2,232)   (2,429)      
Mortgage loans held for portfolio, net 5,187,822   4,816,452      
Accrued Interest - Mortgage loans held for portfolio 31,800   27,400      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 5,141,370   4,769,578      
Mortgage loans held for portfolio, net | Government-guaranteed/insured loans            
Mortgage Loans held for portfolio [Line Items]            
Allowance for credit losses on mortgage loans 0   0      
Mortgage loans held for portfolio, net | Conventional MPF Loan [Member]            
Mortgage Loans held for portfolio [Line Items]            
Allowance for credit losses on mortgage loans (2,232) $ (2,191) (2,429) $ (2,394) $ (2,694) $ (3,018)
Single Family [Member] | Fixed-rate long-term single-family mortgages (1)            
Mortgage Loans held for portfolio [Line Items]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process [3] 5,060,058   4,674,020      
Single Family [Member] | Fixed-rate medium-term single-family mortgages (2)            
Mortgage Loans held for portfolio [Line Items]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process [3] $ 81,312   $ 95,558      
[1] The amortized cost at September 30, 2025 and December 31, 2024 excludes accrued interest receivable.
[2] Amounts exclude accrued interest receivable of $31.8 million at September 30, 2025 and $27.4 million at December 31, 2024
[3] ) Long-term is defined as an original term of greater than 15 years and up to 30 years.
(2) Medium-term is defined as an original term of 15 years or less.