Investment Securities Available For Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Fair Value, Option
Amortized Cost	$ 7,692,982	$ 6,789,275
Unrealized Gains	7,139	135,424
Unrealized Losses	(356,960)	(19,918)
Fair Value	7,343,161	6,904,781
Agency RMBS
Fair Value, Option
Amortized Cost	7,049,587	6,520,774
Unrealized Gains	3,299	128,071
Unrealized Losses	(316,135)	(15,369)
Fair Value	6,736,751	6,633,476
Non-Agency RMBS
Fair Value, Option
Amortized Cost	60,557	22,203
Unrealized Gains	3,840	5,701
Unrealized Losses	(3,575)	(2,312)
Fair Value	60,822	25,592
Non-Agency RMBS \| Collateral Pledged
Fair Value, Option
Fair Value	11,900
U.S. Treasury securities
Fair Value, Option
Amortized Cost	582,838	246,298
Unrealized Gains	0	1,652
Unrealized Losses	(37,250)	(2,237)
Fair Value	545,588	245,713
Fixed rate
Fair Value, Option
Amortized Cost	6,810,942	6,300,852
Unrealized Gains	1,022	124,348
Unrealized Losses	(281,926)	(700)
Fair Value	6,530,038	6,424,500
Adjustable rate
Fair Value, Option
Amortized Cost	101,008	114,427
Unrealized Gains	666	3,662
Unrealized Losses	(209)	0
Fair Value	101,465	118,089
Interest-only
Fair Value, Option
Amortized Cost	137,637	105,495
Unrealized Gains	1,611	61
Unrealized Losses	(34,000)	(14,669)
Fair Value	105,248	90,887
Fannie Mae \| Fixed rate
Fair Value, Option
Amortized Cost	3,599,464	3,445,953
Unrealized Gains	636	71,677
Unrealized Losses	(142,333)	(420)
Fair Value	3,457,767	3,517,210
Fannie Mae \| Adjustable rate
Fair Value, Option
Amortized Cost	74,310	84,215
Unrealized Gains	592	2,911
Unrealized Losses	(187)	0
Fair Value	74,715	87,126
Freddie Mac \| Fixed rate
Fair Value, Option
Amortized Cost	3,211,478	2,854,899
Unrealized Gains	386	52,671
Unrealized Losses	(139,593)	(280)
Fair Value	3,072,271	2,907,290
Freddie Mac \| Adjustable rate
Fair Value, Option
Amortized Cost	26,698	30,212
Unrealized Gains	74	751
Unrealized Losses	(22)	0
Fair Value	26,750	30,963
Freddie Mac \| Interest-only
Fair Value, Option
Amortized Cost	2,610	3,377
Unrealized Gains	486	0
Unrealized Losses	0	(315)
Fair Value	3,096	3,062
Ginnie Mae \| Interest-only
Fair Value, Option
Amortized Cost	135,027	102,118
Unrealized Gains	1,125	61
Unrealized Losses	(34,000)	(14,354)
Fair Value	$ 102,152	$ 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).

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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).

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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).

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