Interest income and interest expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest income
Total loans, net	$ 224,364	$ 226,916	$ 454,447	$ 438,844
Total loans, held for sale	5,326	725	5,544	1,467
Investments held to maturity	14	12	27	20
Preferred equity investments	3,439	2,193	4,523	4,361
Mortgage backed securities, at fair value	976	1,158	1,932	2,280
Total interest income	234,119	231,004	466,473	446,972
Interest expense
Secured borrowings	(51,500)	(47,282)	(99,138)	(92,502)
Paycheck Protection Program Liquidity Facility borrowings	(24)	(124)	(52)	(288)
Securitized debt obligations of consolidated VIEs	(94,476)	(99,558)	(194,728)	(190,159)
Guaranteed loan financing	(17,782)	(4,693)	(36,290)	(9,565)
Senior secured note	(6,368)	(4,397)	(10,749)	(8,778)
Convertible note		(2,188)		(4,376)
Corporate debt	(13,017)	(11,979)	(26,015)	(23,421)
Total interest expense	(183,167)	(170,221)	(366,972)	(329,089)
Net interest income before provision for loan losses	50,952	60,783	99,501	117,883
Bridge
Interest income
Total loans, net	146,418	165,788	294,691	326,219
Total loans, held for sale	124		124
Fixed rate
Interest income
Total loans, net	11,693	12,164	23,959	25,192
Total loans, held for sale	264	701	264	1,436
Construction
Interest income
Total loans, net	25,963	22,337	56,131	34,503
Total loans, held for sale	4,400		4,400
SBA 7(a)
Interest income
Total loans, net	31,945	15,335	63,235	30,256
Paycheck Protection Program loans, held for investment
Interest income
Total loans, net	127	3,435	428	6,442
Other
Interest income
Total loans, net	8,218	7,857	16,003	16,232
Total loans, held for sale	$ 538	$ 24	$ 756	$ 31