Consolidated Obligations - Summary of Issued and Outstanding Consolidated Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total Consolidated obligation bonds	$ 104,967,394	$ 68,466,741
Total Consolidated obligation discount notes	71,261,091	76,019,517
Hedged Consolidated obligation bonds
Debt Instrument [Line Items]
Consolidated obligation bonds-amortized cost	105,191,613	68,433,108
Hedge valuation basis adjustments	(310,447)	(51,438)
Hedge basis adjustments on de-designated hedges	86,533	92,610
FVO - valuation adjustments and accrued interest	(305)	(7,539)
Total Consolidated obligation bonds	104,967,394	68,466,741
Hedged Consolidated obligation discount notes
Debt Instrument [Line Items]
Discount notes-amortized cost	71,295,789	76,011,550
Hedge value basis adjustments	(34,113)	(7,377)
Hedge basis adjustments on de-designated hedges	(585)	(107)
FVO - valuation adjustments and remaining accretion	0	15,451
Total Consolidated obligation discount notes	$ 71,261,091	$ 76,019,517

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