Liability for Losses Under Representations and Warranties (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
During the year:
Balance at beginning of period	$ 43,521	$ 32,688
Provision for losses on loans sold resulting from sales of loans	4,054	10,053
Provision for losses on loans sold reduction in liability due to change in estimate	(3,169)	(3,685)
Losses incurred, net	(1,612)	(628)
Balance at end of period	42,794	38,428
Unpaid principal balance of loans subject to representations and warranties at end of period	$ 271,146,169	$ 220,865,034