Servicing rights (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Servicing rights
Unpaid Principal Amount	$ 7,925,426		$ 7,925,426		$ 6,898,073
Carrying Value	119,768		119,768		102,837
Total servicing rights	119,768	$ 94,893	119,768	$ 94,893	102,837
Servicing rights activity at amortized cost
Beginning net carrying value at amortized cost			102,837
Ending net carrying value at amortized cost	119,768		119,768
SBA servicing rights
Servicing rights
Unpaid Principal Amount	1,534,092		1,534,092		1,208,201
Carrying Value	35,327	24,328	35,327	24,328	29,536
Servicing rights activity at amortized cost
Beginning net carrying value at amortized cost	31,343	22,040	29,536	19,756
Additions	5,596	2,043	8,273	3,555
Amortization	(1,105)	(921)	(1,960)	(1,756)
Recovery (impairment)	(507)	1,166	(522)	2,773
Ending net carrying value at amortized cost	35,327	24,328	35,327	24,328
Multi-family servicing rights
Servicing rights
Unpaid Principal Amount	5,885,203		5,885,203		5,689,872
Carrying Value	70,222	70,565	70,222	70,565	$ 73,301
Servicing rights activity at amortized cost
Beginning net carrying value at amortized cost	72,212	67,911	73,301	67,361
Additions	882	5,311	2,620	8,392
Amortization	(2,872)	(2,657)	(5,699)	(5,188)
Ending net carrying value at amortized cost	70,222	$ 70,565	70,222	$ 70,565
USDA
Servicing rights
Unpaid Principal Amount	506,131		506,131
Carrying Value	14,219		14,219
Servicing rights activity at amortized cost
Additions	14,413		14,413
Amortization	(194)		(194)
Ending net carrying value at amortized cost	$ 14,219		$ 14,219