Variable Interest Entities - Consolidated Balance Sheet related to this consolidated VIE (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
LIABILITIES
Non-recourse securitization obligations, collateralized by residential mortgage loans - at fair value, net	$ 1,031,200		$ 616,557
Securitization costs	2,019	$ 0
Fair Value Option Update, ASC 825
LIABILITIES
Securitization costs	2,000
VIE - Primary Beneficiary
ASSETS
Accrued interest receivable	2,130		1,728
LIABILITIES
Non-recourse securitization obligations, collateralized by residential mortgage loans - principal balance, amortized cost	550,462		619,108
Less: debt issuance costs capitalized	(2,303)		(2,551)
Non-recourse securitization obligations, collateralized by residential mortgage loans, amortized cost, net	548,159		616,557
Non-recourse securitization obligations, collateralized by residential mortgage loans - principal balance, subject to fair value adjustment	500,462		0
Fair value adjustment	(17,421)		0
Non-recourse securitization obligations, collateralized by residential mortgage loans - at fair value, net	483,041		0
Total non-recourse securitization obligations, collateralized by residential mortgage loans, net	1,031,200		616,557
Residential mortgage loans in securitization trust
ASSETS
Fair value	1,077,967		667,365
Residential mortgage loans in securitization trust \| VIE - Primary Beneficiary
ASSETS
Residential mortgage loans in securitization trusts - cost	1,125,597		665,510
Fair value adjustment	(47,630)		1,855
Fair value	$ 1,077,967		$ 667,365

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