Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset [Abstract]
Estimated fair value of MSRs	$ 28,200	$ 45,200
Residential Mortgage
Amortized Cost:
Balance at beginning of period	39,267	38,573	$ 37,663
Originations of MSRs	12,173	7,546	6,756
Amortization	(12,695)	(6,852)	(5,846)
Balance at end of period	38,745	39,267	38,573
Servicing Asset [Abstract]
Beginning balance	0	0	0
Additions to valuation allowance	(10,500)	0	0
Ending balance	(10,500)	0	0
Net MSRs at end of year	28,245	39,267	38,573
Estimated fair value of MSRs	$ 28,245	$ 45,193	$ 50,200