Liability for Losses Under Representations and Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
During the year:
Balance at beginning of period	$ 38,428	$ 23,202	$ 32,688	$ 21,446
Provision for losses on loans sold resulting from sales of loans	10,304	4,189	20,357	7,901
Provision for losses on loans sold reduction in liability due to change in estimate	(3,640)	(1,270)	(7,325)	(2,946)
Losses incurred, net	(757)	(212)	(1,385)	(492)
Balance at end of period	44,335	25,909	44,335	25,909
Unpaid principal balance of loans subject to representations and warranties at end of period	$ 234,327,924	$ 192,064,630	$ 234,327,924	$ 192,064,630