Liability for Losses Under Representations and Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
During the year:
Balance at beginning of period	$ 18,709	$ 20,587	$ 21,155	$ 20,053
Provision for losses on loans sold resulting from sales of loans	2,508	1,842	5,222	4,550
Provision for losses on loans sold reduction in liability due to change in estimate	(1,175)	(1,155)	(6,305)	(3,627)
(Recoveries) incurred losses, net	(74)	(252)	(104)	46
Balance at end of period	19,968	21,022	19,968	21,022
Unpaid principal balance of loans subject to representations and warranties at end of quarter	$ 166,541,153	$ 139,315,779	$ 166,541,153	$ 139,315,779