Fair Values of Financial Instruments - Schedule of Activity Related to Financial Instruments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Fair Value Option Activity [Roll Forward]
Net gains (losses) on financial instruments held under fair value option	$ (3,799,000)	$ (12,180,000)	$ (2,665,000)	$ (28,161,000)
Consolidated Obligation Bonds Fair Value Option
Fair Value Option Activity [Roll Forward]
Balance, beginning of the period	(525,746,000)	(1,726,322,000)	(556,866,000)	(1,704,115,000)
New transactions elected for fair value option	0	0	0	(5,000,000)
Maturities and terminations	304,840,000	200,000,000	339,840,000	200,000,000
Net gains (losses) on financial instruments held under fair value option	(3,007,000)	(12,730,000)	(5,989,000)	(28,711,000)
Change in accrued interest/unaccreted balance	1,073,000	1,307,000	175,000	81,000
Balance, end of the period	(222,840,000)	(1,537,745,000)	(222,840,000)	(1,537,745,000)
Consolidated Obligation - Discount Notes, Fair Value Option
Fair Value Option Activity [Roll Forward]
Balance, beginning of the period	(5,309,607,000)	0	(577,958,000)	0
New transactions elected for fair value option	0	(562,507,000)	(5,295,389,000)	(562,507,000)
Maturities and terminations	0	0	562,507,000	0
Net gains (losses) on financial instruments held under fair value option	(792,000)	550,000	3,324,000	550,000
Change in accrued interest/unaccreted balance	(48,240,000)	(3,693,000)	(51,123,000)	(3,693,000)
Balance, end of the period	(5,358,639,000)	(565,650,000)	(5,358,639,000)	(565,650,000)
Advances, Fair Value Option
Fair Value Option Activity [Roll Forward]
Balance, end of the period	$ 0	$ 0	$ 0	$ 0