Investment Securities Available For Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Option
Amortized Cost	$ 6,789,275	$ 3,886,897
Unrealized Gains	135,424	18,959
Unrealized Losses	(19,918)	(77,312)
Fair Value	6,904,781	3,828,544
Fixed rate
Fair Value, Option
Amortized Cost	6,300,852	2,949,038
Unrealized Gains	124,348	11,733
Unrealized Losses	(700)	(21,711)
Fair Value	6,424,500	2,939,060
Adjustable rate
Fair Value, Option
Amortized Cost	114,427	130,119
Unrealized Gains	3,662	285
Unrealized Losses	0	(822)
Fair Value	118,089	129,582
Interest-only
Fair Value, Option
Amortized Cost	105,495	83,878
Unrealized Gains	61	843
Unrealized Losses	(14,669)	(16,551)
Fair Value	90,887	68,170
Fannie Mae \| Fixed rate
Fair Value, Option
Amortized Cost	3,445,953	1,483,619
Unrealized Gains	71,677	7,819
Unrealized Losses	(420)	(7,991)
Fair Value	3,517,210	1,483,447
Fannie Mae \| Adjustable rate
Fair Value, Option
Amortized Cost	84,215	97,267
Unrealized Gains	2,911	265
Unrealized Losses	0	(631)
Fair Value	87,126	96,901
Freddie Mac \| Fixed rate
Fair Value, Option
Amortized Cost	2,854,899	1,465,419
Unrealized Gains	52,671	3,914
Unrealized Losses	(280)	(13,720)
Fair Value	2,907,290	1,455,613
Freddie Mac \| Adjustable rate
Fair Value, Option
Amortized Cost	30,212	32,852
Unrealized Gains	751	20
Unrealized Losses	0	(191)
Fair Value	30,963	32,681
Freddie Mac \| Interest-only
Fair Value, Option
Amortized Cost	3,377	5,251
Unrealized Gains	0	0
Unrealized Losses	(315)	(459)
Fair Value	3,062	4,792
Ginnie Mae \| Interest-only
Fair Value, Option
Amortized Cost	102,118	78,627
Unrealized Gains	61	843
Unrealized Losses	(14,354)	(16,092)
Fair Value	87,825	63,378
Agency RMBS
Fair Value, Option
Amortized Cost	6,520,774	3,163,035
Unrealized Gains	128,071	12,861
Unrealized Losses	(15,369)	(39,084)
Fair Value	6,633,476	3,136,812
Non-Agency RMBS
Fair Value, Option
Amortized Cost	22,203	66,203
Unrealized Gains	5,701	6,098
Unrealized Losses	(2,312)	(2,614)
Fair Value	25,592	69,687
U.S. Treasury securities
Fair Value, Option
Amortized Cost	246,298	657,659
Unrealized Gains	1,652	0
Unrealized Losses	(2,237)	(35,614)
Fair Value	$ 245,713	$ 622,045

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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