Segment Information Financial Performance (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) Segment	Mar. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | Segment	2
Net interest income	$ 200,867	$ 180,201
Non-interest income (loss)	7,510	(10,378)
Non-interest expense	45,581	28,226
Income (loss) before assessments	162,796	141,597
Affordable Housing Program assessments	16,318	14,185
Net income	146,478	127,412
Traditional Member Finance [Member]
Segment Reporting Information [Line Items]
Net interest income	177,621	146,489
Non-interest income (loss)	8,527	(6,004)
Non-interest expense	41,156	25,449
Income (loss) before assessments	144,992	115,036
Affordable Housing Program assessments	14,538	11,529
Net income	130,454	103,507
Mortgage Purchase Program [Member]
Segment Reporting Information [Line Items]
Net interest income	23,246	33,712
Non-interest income (loss)	(1,017)	(4,374)
Non-interest expense	4,425	2,777
Income (loss) before assessments	17,804	26,561
Affordable Housing Program assessments	1,780	2,656
Net income	$ 16,024	$ 23,905