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Investment Securities Available For Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 5,066,908	$ 3,886,897
Unrealized Gains	62,748	18,959
Unrealized Losses	(20,055)	(77,312)
Fair Value	5,109,601	3,828,544
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,888,646	3,163,035
Unrealized Gains	57,271	12,861
Unrealized Losses	(16,118)	(39,084)
Fair Value	4,929,799	3,136,812
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,849	66,203
Unrealized Gains	5,048	6,098
Unrealized Losses	(2,530)	(2,614)
Fair Value	39,367	69,687
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	141,413	657,659
Unrealized Gains	429	0
Unrealized Losses	(1,407)	(35,614)
Fair Value	140,435	622,045
Fixed rate | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,677,186	2,949,038
Unrealized Gains	50,651	11,733
Unrealized Losses	(5,335)	(21,711)
Fair Value	4,722,502	2,939,060
Fixed rate | Fannie Mae | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,574,338	1,483,619
Unrealized Gains	30,980	7,819
Unrealized Losses	(2,302)	(7,991)
Fair Value	2,603,016	1,483,447
Fixed rate | Freddie Mac | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,102,848	1,465,419
Unrealized Gains	19,671	3,914
Unrealized Losses	(3,033)	(13,720)
Fair Value	2,119,486	1,455,613
Adjustable rate | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	123,067	130,119
Unrealized Gains	2,239	285
Unrealized Losses	0	(822)
Fair Value	125,306	129,582
Adjustable rate | Fannie Mae | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	92,031	97,267
Unrealized Gains	1,759	265
Unrealized Losses	0	(631)
Fair Value	93,790	96,901
Adjustable rate | Freddie Mac | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,036	32,852
Unrealized Gains	480	20
Unrealized Losses	0	(191)
Fair Value	31,516	32,681
Interest-only | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	88,393	83,878
Unrealized Gains	4,381	843
Unrealized Losses	(10,783)	(16,551)
Fair Value	81,991	68,170
Interest-only | Freddie Mac | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,729	5,251
Unrealized Gains	0	0
Unrealized Losses	(748)	(459)
Fair Value	3,981	4,792
Interest-only | Ginnie Mae | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	83,664	78,627
Unrealized Gains	4,381	843
Unrealized Losses	(10,035)	(16,092)
Fair Value	$ 78,010	$ 63,378

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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).

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