Liability for Losses Under Representations and Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
During the year:
Balance at beginning of period	$ 25,909	$ 18,709	$ 21,446	$ 21,155
Provision for losses on loans sold resulting from sales of loans	5,219	2,508	13,120	5,222
Provision for losses on loans sold reduction in liability due to change in estimate	(2,473)	(1,175)	(5,419)	(6,305)
Losses incurred, net	(151)	(74)	(643)	(104)
Balance at end of period	28,504	19,968	28,504	19,968
Unpaid principal balance of loans subject to representations and warranties at end of year	$ 199,194,983	$ 166,541,153	$ 199,194,983	$ 166,541,153