v3.26.1
Derivatives and Hedging Activities Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Advances [Member]    
ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock [Line Items]    
Hedged Asset, Fair Value Hedge [1] $ 23,115,739 $ 28,592,914
HedgedAssetActiveFairValueHedgeCumulativeIncreaseDecrease (146,939) (17,351)
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (130) (479)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) [2] (147,069) (17,830)
Categories of Investments, Marketable Securities, Available-for-sale Securities [Member]    
ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock [Line Items]    
Hedged Asset, Fair Value Hedge [1] 17,509,847 19,125,045
HedgedAssetActiveFairValueHedgeCumulativeIncreaseDecrease (419,691) (210,472)
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (6,449) (7,822)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) [2] (426,140) (218,294)
Consolidated Obligation Bonds [Member]    
ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock [Line Items]    
Hedged Liability, Fair Value Hedge [1] 30,395,004 30,995,980
HedgedLiabilityActiveFairValueHedgeCumulativeIncreaseDecrease (489,206) (460,026)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 36 404
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) [2] $ (489,170) $ (459,622)
[1] Reflects the amortized cost of hedged items in active or discontinued fair value hedging relationships, which includes fair value hedging basis adjustments.
[2] Reflects the cumulative life-to-date unamortized hedging gains (losses) on the hedged items.