Investment Securities Available For Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Option
Amortized Cost	$ 6,908,528	$ 6,789,275
Unrealized Gains	77,600	135,424
Unrealized Losses	(25,815)	(19,918)
Fair Value	6,960,313	6,904,781
Agency RMBS
Fair Value, Option
Amortized Cost	6,575,725	6,520,774
Unrealized Gains	72,112	128,071
Unrealized Losses	(17,860)	(15,369)
Fair Value	6,629,977	6,633,476
Non-Agency RMBS
Fair Value, Option
Amortized Cost	27,600	22,203
Unrealized Gains	4,867	5,701
Unrealized Losses	(2,307)	(2,312)
Fair Value	30,160	25,592
U.S. Treasury securities
Fair Value, Option
Amortized Cost	305,203	246,298
Unrealized Gains	621	1,652
Unrealized Losses	(5,648)	(2,237)
Fair Value	300,176	245,713
Fixed rate
Fair Value, Option
Amortized Cost	6,346,238	6,300,852
Unrealized Gains	66,972	124,348
Unrealized Losses	(6,478)	(700)
Fair Value	6,406,732	6,424,500
Adjustable rate
Fair Value, Option
Amortized Cost	108,026	114,427
Unrealized Gains	2,759	3,662
Unrealized Losses	0	0
Fair Value	110,785	118,089
Interest-only
Fair Value, Option
Amortized Cost	121,461	105,495
Unrealized Gains	2,381	61
Unrealized Losses	(11,382)	(14,669)
Fair Value	112,460	90,887
Fannie Mae \| Fixed rate
Fair Value, Option
Amortized Cost	3,388,655	3,445,953
Unrealized Gains	39,953	71,677
Unrealized Losses	(2,555)	(420)
Fair Value	3,426,053	3,517,210
Fannie Mae \| Adjustable rate
Fair Value, Option
Amortized Cost	79,629	84,215
Unrealized Gains	2,186	2,911
Unrealized Losses	0	0
Fair Value	81,815	87,126
Freddie Mac \| Fixed rate
Fair Value, Option
Amortized Cost	2,957,583	2,854,899
Unrealized Gains	27,019	52,671
Unrealized Losses	(3,923)	(280)
Fair Value	2,980,679	2,907,290
Freddie Mac \| Adjustable rate
Fair Value, Option
Amortized Cost	28,397	30,212
Unrealized Gains	573	751
Unrealized Losses	0	0
Fair Value	28,970	30,963
Freddie Mac \| Interest-only
Fair Value, Option
Amortized Cost	2,918	3,377
Unrealized Gains	47	0
Unrealized Losses	0	(315)
Fair Value	2,965	3,062
Ginnie Mae \| Interest-only
Fair Value, Option
Amortized Cost	118,543	102,118
Unrealized Gains	2,334	61
Unrealized Losses	(11,382)	(14,354)
Fair Value	$ 109,495	$ 87,825

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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