Interest income and interest expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income
Total loans, net	$ 230,083	$ 211,928
Total loans, held for sale, at fair value	218	742
Investments held to maturity	13	8
Preferred equity investments	1,084	2,168
Mortgage backed securities, at fair value	956	1,122
Total interest income	232,354	215,968
Interest expense
Secured borrowings	(47,638)	(45,220)
Securitized debt obligations of consolidated VIEs	(100,252)	(90,601)
Guaranteed loan financing	(18,508)	(4,872)
Senior secured note	(4,381)	(4,381)
Convertible note		(2,188)
Corporate debt	(12,998)	(11,442)
Total interest expense	(183,805)	(158,868)
Net interest income before provision for loan losses	48,549	57,100
Other Liabilities
Interest expense
Paycheck Protection Program Liquidity Facility borrowings	(28)	(164)
Bridge
Interest income
Total loans, net	148,273	160,431
Fixed rate
Interest income
Total loans, net	12,266	13,028
Total loans, held for sale, at fair value		735
Construction
Interest income
Total loans, net	30,168	12,166
SBA 7(a)
Interest income
Total loans, net	31,290	14,921
Paycheck Protection Program loans, held for investment | Other Assets
Interest income
Total loans, net	301	3,007
Other
Interest income
Total loans, net	7,785	8,375
Total loans, held for sale, at fair value	$ 218	$ 7