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Investment Securities Available For Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 6,748,236 | $ 3,886,897
Unrealized Gains | 108,652 | 18,959
Unrealized Losses | (18,173) | (77,312)
Fair Value | 6,838,715 | 3,828,544
Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,543,283 | 3,163,035
Unrealized Gains | 99,727 | 12,861
Unrealized Losses | (15,007) | (39,084)
Fair Value | 6,628,003 | 3,136,812
Non-Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 24,085 | 66,203
Unrealized Gains | 6,405 | 6,098
Unrealized Losses | (2,316) | (2,614)
Fair Value | 28,174 | 69,687
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 180,868 | 657,659
Unrealized Gains | 2,520 | 0
Unrealized Losses | (850) | (35,614)
Fair Value | 182,538 | 622,045
Fixed rate | Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,309,171 | 2,949,038
Unrealized Gains | 94,530 | 11,733
Unrealized Losses | (1,132) | (21,711)
Fair Value | 6,402,569 | 2,939,060
Fixed rate | Fannie Mae | Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,505,119 | 1,483,619
Unrealized Gains | 54,745 | 7,819
Unrealized Losses | (752) | (7,991)
Fair Value | 3,559,112 | 1,483,447
Fixed rate | Freddie Mac | Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,804,052 | 1,465,419
Unrealized Gains | 39,785 | 3,914
Unrealized Losses | (380) | (13,720)
Fair Value | 2,843,457 | 1,455,613
Adjustable rate | Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 119,192 | 130,119
Unrealized Gains | 3,796 | 285
Unrealized Losses | 0 | (822)
Fair Value | 122,988 | 129,582
Adjustable rate | Fannie Mae | Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 88,317 | 97,267
Unrealized Gains | 2,981 | 265
Unrealized Losses | 0 | (631)
Fair Value | 91,298 | 96,901
Adjustable rate | Freddie Mac | Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 30,875 | 32,852
Unrealized Gains | 815 | 20
Unrealized Losses | 0 | (191)
Fair Value | 31,690 | 32,681
Interest-only | Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 114,920 | 83,878
Unrealized Gains | 1,401 | 843
Unrealized Losses | (13,875) | (16,551)
Fair Value | 102,446 | 68,170
Interest-only | Freddie Mac | Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,461 | 5,251
Unrealized Gains | 0 | 0
Unrealized Losses | (931) | (459)
Fair Value | 3,530 | 4,792
Interest-only | Ginnie Mae | Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 110,459 | 78,627
Unrealized Gains | 1,401 | 843
Unrealized Losses | (12,944) | (16,092)
Fair Value | $ 98,916 | $ 63,378

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- Definition 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). + References 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 + Details
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