Investments AFS - Unrealized Loss Position Table (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	$ 3,797,603	$ 6,255,765
AFS - Unrealized Losses - Less than 12 months	(4,759)	(30,368)
AFS - Fair Value - 12 months or longer	5,011,753	3,924,606
AFS - Unrealized Losses - 12 months or longer	(95,570)	(86,942)
AFS - Fair Value - Total in Continuous Loss Position	8,809,356	10,180,371
AFS - Unrealized Losses - Total in Continuous Loss Position	(100,329)	(117,310)
GSE obligations
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	3,798	0
AFS - Unrealized Losses - Less than 12 months	(52)	0
AFS - Fair Value - 12 months or longer	32,570	32,837
AFS - Unrealized Losses - 12 months or longer	(2,189)	(1,985)
AFS - Fair Value - Total in Continuous Loss Position	36,368	32,837
AFS - Unrealized Losses - Total in Continuous Loss Position	(2,241)	(1,985)
State or local agency obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	23,517	2,229
AFS - Unrealized Losses - Less than 12 months	(423)	(11)
AFS - Fair Value - 12 months or longer	145,814	149,653
AFS - Unrealized Losses - 12 months or longer	(12,946)	(9,327)
AFS - Fair Value - Total in Continuous Loss Position	169,331	151,882
AFS - Unrealized Losses - Total in Continuous Loss Position	(13,369)	(9,338)
Non-MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	2,182,309	2,658,135
AFS - Unrealized Losses - Less than 12 months	(2,818)	(4,577)
AFS - Fair Value - 12 months or longer	248,269	276,899
AFS - Unrealized Losses - 12 months or longer	(18,848)	(15,099)
AFS - Fair Value - Total in Continuous Loss Position	2,430,578	2,935,034
AFS - Unrealized Losses - Total in Continuous Loss Position	(21,666)	(19,676)
U.S. obligations single-family
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	146,170	722,587
AFS - Unrealized Losses - Less than 12 months	(110)	(5,968)
AFS - Fair Value - 12 months or longer	929,359	291,262
AFS - Unrealized Losses - 12 months or longer	(16,414)	(10,719)
AFS - Fair Value - Total in Continuous Loss Position	1,075,529	1,013,849
AFS - Unrealized Losses - Total in Continuous Loss Position	(16,524)	(16,687)
Private label MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	6,355	18,497
AFS - Unrealized Losses - Less than 12 months	(156)	(686)
AFS - Fair Value - 12 months or longer	37,055	27,259
AFS - Unrealized Losses - 12 months or longer	(3,518)	(2,759)
AFS - Fair Value - Total in Continuous Loss Position	43,410	45,756
AFS - Unrealized Losses - Total in Continuous Loss Position	(3,674)	(3,445)
MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	1,615,294	3,597,630
AFS - Unrealized Losses - Less than 12 months	(1,941)	(25,791)
AFS - Fair Value - 12 months or longer	4,763,484	3,647,707
AFS - Unrealized Losses - 12 months or longer	(76,722)	(71,843)
AFS - Fair Value - Total in Continuous Loss Position	6,378,778	7,245,337
AFS - Unrealized Losses - Total in Continuous Loss Position	(78,663)	(97,634)
U.S. Treasury obligations
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	2,154,994	2,655,906
AFS - Unrealized Losses - Less than 12 months	(2,343)	(4,566)
AFS - Fair Value - 12 months or longer	69,885	94,409
AFS - Unrealized Losses - 12 months or longer	(3,713)	(3,787)
AFS - Fair Value - Total in Continuous Loss Position	2,224,879	2,750,315
AFS - Unrealized Losses - Total in Continuous Loss Position	(6,056)	(8,353)
Single Family [Member] \| GSE MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	789,517	205,891
AFS - Unrealized Losses - Less than 12 months	(1,274)	(2,279)
AFS - Fair Value - 12 months or longer	1,430,001	1,329,086
AFS - Unrealized Losses - 12 months or longer	(48,702)	(50,404)
AFS - Fair Value - Total in Continuous Loss Position	2,219,518	1,534,977
AFS - Unrealized Losses - Total in Continuous Loss Position	(49,976)	(52,683)
Multifamily [Member] \| GSE MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	673,252	2,650,655
AFS - Unrealized Losses - Less than 12 months	(401)	(16,858)
AFS - Fair Value - 12 months or longer	2,367,069	2,000,100
AFS - Unrealized Losses - 12 months or longer	(8,088)	(7,961)
AFS - Fair Value - Total in Continuous Loss Position	3,040,321	4,650,755
AFS - Unrealized Losses - Total in Continuous Loss Position	$ (8,489)	$ (24,819)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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