v3.26.1
Fair Value Measures and Disclosures (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Advances [Member]    
Derivative [Line Items]    
Hedged Asset, Fair Value Hedge [1] $ 12,763,415 $ 12,068,299
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) (109,168) (23,668)
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (4) (39)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) (109,172) (23,707)
Available-for-sale Securities    
Derivative [Line Items]    
Hedged Asset, Fair Value Hedge [1] 11,039,253 9,799,500
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) (251,062) (118,369)
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 457 506
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) (250,605) (117,863)
Consolidated Obligation Bonds    
Derivative [Line Items]    
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) (72,679) (98,044)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 0 0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) (72,679) (98,044)
Hedged Liability, Fair Value Hedge [1]   16,589,988
Short-term Debt [Member]    
Derivative [Line Items]    
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) (12,769) 1,459
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 0 0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) (12,769) 1,459
Hedged Liability, Fair Value Hedge $ 27,734,871 $ 14,814,633
[1] Includes only the portion of amortized cost representing the hedged items in active or discontinued fair value hedging relationships. Amortized cost includes fair value hedging adjustments.