Related Party Transactions - Schedule Statement of Income of Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Manager | Management fee (including management termination fee)
Related Party Transaction [Line Items]
Amount of transaction	$ 17,459	$ 1,828
Manager | Income from equity investment
Related Party Transaction [Line Items]
Amount of transaction	3,113	2
Various non-consolidated joint ventures | Interest income on securities and beneficial interest and net decrease in the net present value of expected credit losses on beneficial interests
Related Party Transaction [Line Items]
Amount of transaction	2,357	4,570
Servicer | Income from equity investment
Related Party Transaction [Line Items]
Amount of transaction	(26)	(67)
Servicer | Loan servicing fees
Related Party Transaction [Line Items]
Amount of transaction	1,734	1,860
Servicer | Affiliate loan interest income
Related Party Transaction [Line Items]
Amount of transaction	253	65
Gaea | Income from equity investment
Related Party Transaction [Line Items]
Amount of transaction	(1)	(243)
Gaea | Affiliate loan interest income
Related Party Transaction [Line Items]
Amount of transaction	92	0
2019-H | Loss from joint venture re-securitization on beneficial interests
Related Party Transaction [Line Items]
Amount of transaction	0	(995)
AS Ajax E LLC | Income from equity investment
Related Party Transaction [Line Items]
Amount of transaction	10	11
Loan pool LLCs | Income from equity investment
Related Party Transaction [Line Items]
Amount of transaction	$ (7)	$ (10)