Residential Mortgage Loans - Derivative Instruments Related to Mortgage Loan Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Forward mortgage loan purchase commitments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notional	$ 267,644	$ 83,962
Derivative Assets	1,286	708
Derivative Liabilities	0	0
Forward RMBS purchase contracts | Designated as Hedging Instrument
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notional	274,000	51,100
Derivative Assets	221	715
Derivative Liabilities	94	817
Cash collateral receivable (payable)	1,000	715
Interest rate swap futures contracts | Designated as Hedging Instrument
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notional	51,500	7,300
Derivative Assets	1,323	489
Derivative Liabilities	0	0
Cash collateral receivable (payable)	$ 2,000	$ 720