Secured Financing Agreements - Narrative (Details) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2026 USD ($) facility	Dec. 31, 2025 USD ($)
Repurchase Agreement Counterparty [Line Items]
Secured Financing Agreements, Unpaid Principal/Notional	$ 7,725,542	$ 6,031,182
Margin cash collateral pledged to repurchase agreement counterparties	$ 7,756	$ 16,968
Securities sold under agreements to repurchase, haircut	8.00%	8.00%
Weighted average maturity	1 year
Decrease in share price (as a percent)	50.00%
Number of warehouse financing facilities under master repurchase agreements \| facility	7
Secured financing agreements	$ 283,984	$ 298,663
Securities sold under agreements to repurchase, weighted average borrowing rate	5.00%	5.00%
Nomura
Repurchase Agreement Counterparty [Line Items]
Amount at risk	$ 347,000	$ 459,000
Warehouse Agreement Borrowings
Repurchase Agreement Counterparty [Line Items]
Unused warehouse credit facilities	$ 2,100,000
Repurchase Agreements \| Nomura \| Stockholders' Equity, Total \| Credit Concentration Risk \| Asset Pledged as Collateral
Repurchase Agreement Counterparty [Line Items]
Concentration risk (as a percent)	14.00%	18.00%
Weighted average maturity	172 days	287 days
Minimum \| Warehouse Agreement Borrowings
Repurchase Agreement Counterparty [Line Items]
Maturity dates of credit facility	3 months
Maximum \| Warehouse Agreement Borrowings
Repurchase Agreement Counterparty [Line Items]
Maturity dates of credit facility	1 year
Not Subject to Additional Margin Requirements Upon Change in Fair Value of Collateral Pledged
Repurchase Agreement Counterparty [Line Items]
Secured Financing Agreements, Unpaid Principal/Notional	$ 833,000	$ 890,000
Not Subject to Additional Margin Requirements Until Drop in Fair Value of Collateral
Repurchase Agreement Counterparty [Line Items]
Secured Financing Agreements, Unpaid Principal/Notional	$ 356,000	$ 402,000
Agency RMBS - Interest-only \| Investment Portfolio Segment
Repurchase Agreement Counterparty [Line Items]
Securities sold under agreements to repurchase, haircut	4.20%	4.40%
Agency CMBS - Project loans \| Investment Portfolio Segment
Repurchase Agreement Counterparty [Line Items]
Securities sold under agreements to repurchase, haircut	4.00%	5.40%
Loans held for sale, at fair value \| Investment Portfolio Segment
Repurchase Agreement Counterparty [Line Items]
Securities sold under agreements to repurchase, haircut	9.00%
Non-agency MBS and Loans held for investment \| Investment Portfolio Segment
Repurchase Agreement Counterparty [Line Items]
Securities sold under agreements to repurchase, haircut	25.90%	27.10%
Secured financing agreements, at fair value
Repurchase Agreement Counterparty [Line Items]
Secured Financing Agreements, Unpaid Principal/Notional	$ 293,052	$ 305,817
Fair value of pledged collateral	340,000	360,000
Secured financing agreements	$ 283,984	$ 298,663

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