Transfers of Financial Assets Servicing Assets at Amortized Cost Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning Balance	$ 18,712	$ 23,341	$ 21,215	$ 25,139
Additions	966	1,428	2,219	3,878
Amortization	(1,801)	(2,125)	(5,557)	(6,373)
Ending Balance	$ 17,877	$ 22,644	$ 17,877	$ 22,644