Variable Interest Entities - Income and expense amounts related to the consolidated VIE (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Variable Interest Entity [Line Items]
Interest income	$ 27,109	$ 10,033
Interest expense, non-recourse liabilities (2)	(10,170)	(832)
NET INTEREST INCOME	16,939	$ 9,201
Unrealized gain on mark-to-market of non-recourse securitization obligation - at fair value	17,421
Securitization expenses incurred in issuance of AOMT 2022-1	(2,019)
VIE - Primary Beneficiary
Variable Interest Entity [Line Items]
Interest income	9,508
Interest expense, non-recourse liabilities (2)	(4,583)
NET INTEREST INCOME	4,925
Net unrealized loss on mortgage loans in securitization trusts - at fair value	(55,174)
Operating expenses	(195)
Net expense from consolidated VIEs	$ (35,042)