Transfers of Financial Assets Servicing Assets at Amortized Cost Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning balance	$ 17,484	$ 21,215	$ 25,139
Additions	4,373	3,587	4,459
Amortization	(6,562)	(7,318)	(8,383)
Valuation allowance	(1,873)	0	0
Ending balance	$ 13,422	$ 17,484	$ 21,215