Investments AFS - Unrealized Loss Position Table (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	$ 4,347,920	$ 1,753,625
AFS - Unrealized Losses - Less than 12 months	(8,661)	(1,769)
AFS - Fair Value - 12 months or longer	2,834,436	3,845,710
AFS - Unrealized Losses - 12 months or longer	(39,964)	(45,579)
AFS - Fair Value - Total in Continuous Loss Position	7,182,356	5,599,335
AFS - Unrealized Losses - Total in Continuous Loss Position	(48,625)	(47,348)
GSE obligations
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	3,839	0
AFS - Unrealized Losses - Less than 12 months	(11)	0
AFS - Fair Value - 12 months or longer	26,401	26,616
AFS - Unrealized Losses - 12 months or longer	(1,184)	(1,010)
AFS - Fair Value - Total in Continuous Loss Position	30,240	26,616
AFS - Unrealized Losses - Total in Continuous Loss Position	(1,195)	(1,010)
State or local agency obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	33,315	594
AFS - Unrealized Losses - Less than 12 months	(435)	(6)
AFS - Fair Value - 12 months or longer	124,677	154,103
AFS - Unrealized Losses - 12 months or longer	(6,228)	(6,687)
AFS - Fair Value - Total in Continuous Loss Position	157,992	154,697
AFS - Unrealized Losses - Total in Continuous Loss Position	(6,663)	(6,693)
Non-MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	1,157,174	403,336
AFS - Unrealized Losses - Less than 12 months	(1,784)	(45)
AFS - Fair Value - 12 months or longer	151,078	230,308
AFS - Unrealized Losses - 12 months or longer	(7,412)	(7,929)
AFS - Fair Value - Total in Continuous Loss Position	1,308,252	633,644
AFS - Unrealized Losses - Total in Continuous Loss Position	(9,196)	(7,974)
U.S. obligations single-family
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	375,857	118,520
AFS - Unrealized Losses - Less than 12 months	(687)	(162)
AFS - Fair Value - 12 months or longer	349,792	616,484
AFS - Unrealized Losses - 12 months or longer	(4,714)	(6,133)
AFS - Fair Value - Total in Continuous Loss Position	725,649	735,004
AFS - Unrealized Losses - Total in Continuous Loss Position	(5,401)	(6,295)
Private label MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	8,225	1,858
AFS - Unrealized Losses - Less than 12 months	(214)	(26)
AFS - Fair Value - 12 months or longer	22,748	24,089
AFS - Unrealized Losses - 12 months or longer	(1,121)	(1,191)
AFS - Fair Value - Total in Continuous Loss Position	30,973	25,947
AFS - Unrealized Losses - Total in Continuous Loss Position	(1,335)	(1,217)
MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	3,190,746	1,350,289
AFS - Unrealized Losses - Less than 12 months	(6,877)	(1,724)
AFS - Fair Value - 12 months or longer	2,683,358	3,615,402
AFS - Unrealized Losses - 12 months or longer	(32,552)	(37,650)
AFS - Fair Value - Total in Continuous Loss Position	5,874,104	4,965,691
AFS - Unrealized Losses - Total in Continuous Loss Position	(39,429)	(39,374)
U.S. Treasury obligations
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	1,120,020	402,742
AFS - Unrealized Losses - Less than 12 months	(1,338)	(39)
AFS - Fair Value - 12 months or longer	0	49,589
AFS - Unrealized Losses - 12 months or longer	0	(232)
AFS - Fair Value - Total in Continuous Loss Position	1,120,020	452,331
AFS - Unrealized Losses - Total in Continuous Loss Position	(1,338)	(271)
Single Family [Member] \| GSE MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	2,004,523	1,066,790
AFS - Unrealized Losses - Less than 12 months	(4,164)	(1,336)
AFS - Fair Value - 12 months or longer	1,031,102	1,264,868
AFS - Unrealized Losses - 12 months or longer	(23,030)	(26,127)
AFS - Fair Value - Total in Continuous Loss Position	3,035,625	2,331,658
AFS - Unrealized Losses - Total in Continuous Loss Position	(27,194)	(27,463)
Multifamily [Member] \| GSE MBS [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
AFS - Fair Value - Less than 12 Months	802,141	163,121
AFS - Unrealized Losses - Less than 12 months	(1,812)	(200)
AFS - Fair Value - 12 months or longer	1,279,716	1,709,961
AFS - Unrealized Losses - 12 months or longer	(3,687)	(4,199)
AFS - Fair Value - Total in Continuous Loss Position	2,081,857	1,873,082
AFS - Unrealized Losses - Total in Continuous Loss Position	$ (5,499)	$ (4,399)

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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