v3.26.1
Advances (Portfolio by Year of Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Federal Home Loan Bank, Advances [Line Items]    
Accrued Interest - Advances $ 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
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Rolling Year [Abstract]    
Due in 1 year or less 3.88% 4.04%
Due after 1 year through 2 years 3.95% 4.05%
Due after 2 years through 3 years 3.92% 4.07%
Due after 3 years through 4 years 4.07% 4.18%
Due after 4 years through 5 years 4.16% 4.06%
Thereafter 3.39% 3.42%
Total par value, Weighted Average Interest Rate 3.90% 4.05%
Federal Home Loan Bank, Advances, Maturity, Rolling Year, Par Value [Abstract]    
Due in 1 year or less $ 50,047,946 $ 23,332,978
Due after 1 year through 2 years 16,930,773 9,454,980
Due after 2 years through 3 years 9,454,205 3,640,350
Due after 3 years through 4 years 396,707 202,445
Due after 4 years through 5 years 817,637 60,822
Thereafter 145,534 152,191
Total Par Value 77,792,802 36,843,766
Deferred prepayment fees 0 (67)
Hedging adjustments (109,172) (23,707)
Total book value 77,683,630 36,819,992
Federal Home Loan Bank Advances    
Federal Home Loan Bank, Advances [Line Items]    
Accrued Interest - Advances $ 254,900 $ 158,400