Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Non-recourse
Variable Interest Entity [Line Items]
Non-recourse securitization obligations, collateralized by residential mortgage loans in securitization trusts	$ 1,146,641	$ 1,169,154
VIE - Primary Beneficiary | Non-recourse
Variable Interest Entity [Line Items]
Non-recourse securitization obligations, collateralized by residential mortgage loans in securitization trusts	1,200,000	1,200,000
Loan securitization transactions
Variable Interest Entity [Line Items]
Securitized loans	$ 1,300,000	$ 1,300,000