Repurchase Agreements and Warehouse Facilities - Schedule of Repurchase Agreements Secured by Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	$ 6,633,635	$ 6,154,086
Fair Value of Collateral Pledged	4,939,908	4,438,882
Agency RMBS, Non-Agency RMBS And U.S. Treasury Securities
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	6,633,635	6,154,086
Fair Value of Collateral Pledged	6,851,281	6,412,129
Amortized Cost of Collateral Pledged	7,172,140	6,302,640
Agency RMBS, Non-Agency RMBS And U.S. Treasury Securities \| Collateral Pledged
Assets Sold under Agreements to Repurchase [Line Items]
Restricted cash		16,600
Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	6,034,535	5,894,367
Fair Value of Collateral Pledged	6,247,095	6,143,730
Amortized Cost of Collateral Pledged	6,529,816	6,033,884
Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	37,960	15,191
Fair Value of Collateral Pledged	42,025	22,686
Amortized Cost of Collateral Pledged	42,913	22,458
Non-Agency RMBS \| Consolidated SLST
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged		18,600
U.S. Treasury securities
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	561,140	244,528
Fair Value of Collateral Pledged	562,161	245,713
Amortized Cost of Collateral Pledged	$ 599,411	$ 246,298

Assets Sold Under Agreements To Repurchase, Amortized Cost Of Collateral Pledged

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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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