Variable Interest Entities - Schedule of Securitization Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Current Face	$ 2,280,688
VIEntity - Primary Beneficiary | Loan securitization transactions
Variable Interest Entity [Line Items]
Aggregate unpaid principal balance of residential whole loans sold	2,090,583	$ 1,781,311
Fair value adjustment for residential mortgage loans in securitization trusts	(13,807)	(84,316)
Residential mortgage loans in securitization trusts, at fair value	$ 2,076,776	$ 1,696,995
Weighted average contractual maturity of Senior Bonds	45 years	45 years
Aggregate unpaid principal balance of residential whole loans sold, at deal date	$ 2,885,625	$ 2,326,980
Cash received, at deal date	320,116	273,266
VIEntity - Primary Beneficiary | Loan securitization transactions | Face amount of Senior Support Certificates received by the Company, at deal date
Variable Interest Entity [Line Items]
Current Face	160,139	132,206
VIEntity - Primary Beneficiary | Loan securitization transactions | Non-recourse
Variable Interest Entity [Line Items]
Outstanding amount of non-recourse securitization obligation, at amortized cost	1,915,389	1,630,083
Fair value adjustment for the portion of non-recourse securitization obligation, at fair value option	(68)	(36,471)
Non-recourse securitization obligation, collateralized by residential mortgage loans in securitization trusts	$ 1,915,321	$ 1,593,612
Weighted average fixed rate for non-recourse securitization obligation issued	4.25%	3.86%
VIEntity - Primary Beneficiary | Loan securitization transactions | Non-recourse | Face amount of Non-recourse securitization obligation issued by the VIE and purchased by third-party investors, at deal date
Variable Interest Entity [Line Items]
Current Face	$ 2,725,486	$ 2,194,774