Repurchase Agreements and Warehouse Facilities - Schedule of Repurchase Agreements Secured by Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	$ 6,100,691	$ 3,516,611
Fair Value of Collateral Pledged	4,256,683	3,841,738
Agency RMBS, Non-Agency RMBS And U.S. Treasury Securities
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	6,100,691	3,516,611
Fair Value of Collateral Pledged	6,345,405	3,676,585
Amortized Cost of Collateral Pledged	6,262,373	3,729,642
Agency RMBS, Non-Agency RMBS And U.S. Treasury Securities \| Collateral Pledged
Assets Sold under Agreements to Repurchase [Line Items]
Restricted cash	700	11,800
Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	5,903,078	2,830,925
Fair Value of Collateral Pledged	6,136,353	2,975,400
Amortized Cost of Collateral Pledged	6,055,555	2,995,820
Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	18,482	50,622
Fair Value of Collateral Pledged	27,662	67,352
Amortized Cost of Collateral Pledged	27,073	64,375
Non-Agency RMBS \| Consolidated SLST
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged	22,000	20,600
U.S. Treasury securities
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	179,131	635,064
Fair Value of Collateral Pledged	181,390	633,833
Amortized Cost of Collateral Pledged	$ 179,745	$ 669,447

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Amount, including accrued interest, to be repaid to counterparty to repurchase agreement when carrying amount or market value if higher, of security or other asset sold under repurchase agreement exceeds 10 percent of total assets.

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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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