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Investment Securities Available For Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,618,661	$ 3,886,897
Unrealized Gains	51,719	18,959
Unrealized Losses	(23,568)	(77,312)
Fair Value	4,646,812	3,828,544
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,532,616	3,163,035
Unrealized Gains	46,108	12,861
Unrealized Losses	(20,004)	(39,084)
Fair Value	4,558,720	3,136,812
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	60,703	66,203
Unrealized Gains	5,611	6,098
Unrealized Losses	(2,527)	(2,614)
Fair Value	63,787	69,687
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25,342	657,659
Unrealized Gains	0	0
Unrealized Losses	(1,037)	(35,614)
Fair Value	24,305	622,045
Fixed rate | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,325,156	2,949,038
Unrealized Gains	41,378	11,733
Unrealized Losses	(6,080)	(21,711)
Fair Value	4,360,454	2,939,060
Fixed rate | Fannie Mae | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,252,190	1,483,619
Unrealized Gains	24,074	7,819
Unrealized Losses	(2,451)	(7,991)
Fair Value	2,273,813	1,483,447
Fixed rate | Freddie Mac | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,072,966	1,465,419
Unrealized Gains	17,304	3,914
Unrealized Losses	(3,629)	(13,720)
Fair Value	2,086,641	1,455,613
Adjustable rate | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	126,208	130,119
Unrealized Gains	2,246	285
Unrealized Losses	0	(822)
Fair Value	128,454	129,582
Adjustable rate | Fannie Mae | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	94,785	97,267
Unrealized Gains	1,776	265
Unrealized Losses	0	(631)
Fair Value	96,561	96,901
Adjustable rate | Freddie Mac | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,423	32,852
Unrealized Gains	470	20
Unrealized Losses	0	(191)
Fair Value	31,893	32,681
Interest-only | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	81,252	83,878
Unrealized Gains	2,484	843
Unrealized Losses	(13,924)	(16,551)
Fair Value	69,812	68,170
Interest-only | Freddie Mac | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,006	5,251
Unrealized Gains	0	0
Unrealized Losses	(770)	(459)
Fair Value	4,236	4,792
Interest-only | Ginnie Mae | Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	76,246	78,627
Unrealized Gains	2,484	843
Unrealized Losses	(13,154)	(16,092)
Fair Value	$ 65,576	$ 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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