v3.26.1
Mortgage Loans Held for Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Mortgage Loans held for portfolio [Line Items]    
Accrued Interest - Mortgage loans held for portfolio $ 5,476,529 $ 5,220,302
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 $ 80,719 $ 84,188
Conventional MPF Loan [Member]    
Mortgage Loans held for portfolio [Line Items]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss [1] 5,396,459 5,136,949
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year [1] 2,984,697 2,134,535
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 5,353,151 5,090,977
Mortgage loans held for portfolio, net    
Mortgage Loans held for portfolio [Line Items]    
Premiums 78,157 73,778
Discounts (11,272) (11,766)
Hedging adjustments (22,062) (14,400)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss [2] 5,478,693 5,222,777
Allowance for credit losses on mortgage loans (2,164) (2,475)
Mortgage loans held for portfolio, net 5,476,529 5,220,302
Accrued Interest - Mortgage loans held for portfolio 35,800 33,600
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 5,433,870 5,175,165
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] 5,365,976 5,098,101
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] $ 67,894 $ 77,064
[1] The amortized cost at June 30, 2026 and December 31, 2025 excludes accrued interest receivable.
[2] Amounts exclude accrued interest receivable of $35.8 million at June 30, 2026 and $33.6 million at December 31, 2025
[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.