Segment Information - Components of Corporate/Other (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Interest income	$ 178,516	$ 189,400
Interest expense	(152,079)	(136,298)
Net Interest Income	26,437	53,102
Investment fair value changes, net	(127)	(6,120)
Other income, net	4,556	5,983
Realized gains (losses), net	(2)	2,581
Total non-interest income, net	21,098	18,759
General and administrative expenses	(35,555)	(33,276)
Net Income	4,620	30,915
Corporate/ Other
Segment Reporting Information [Line Items]
Interest income	4,852	1,020
Interest expense	(17,723)	(10,213)
Net Interest Income	(12,871)	(9,193)
Investment fair value changes, net	(189)	(714)
Other income, net	(20)	126
Realized gains (losses), net	115	0
Total non-interest income, net	(94)	(588)
General and administrative expenses	(15,662)	(15,148)
Net Income	(28,627)	(24,929)
Corporate/ Other | Legacy Consolidated VIEs
Segment Reporting Information [Line Items]
Interest income	2,543	1,012
Interest expense	(2,504)	(701)
Net Interest Income	39	311
Investment fair value changes, net	(94)	(714)
Other income, net	0	0
Realized gains (losses), net	0	0
Total non-interest income, net	(94)	(714)
General and administrative expenses	0	0
Net Income	(55)	(403)
Corporate/ Other | Other
Segment Reporting Information [Line Items]
Interest income	2,309	8
Interest expense	(15,219)	(9,512)
Net Interest Income	(12,910)	(9,504)
Investment fair value changes, net	(95)	0
Other income, net	(20)	126
Realized gains (losses), net	115	0
Total non-interest income, net	0	126
General and administrative expenses	(15,662)	(15,148)
Net Income	$ (28,572)	$ (24,526)