Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Servicing Asset [Abstract]
Fair value of MSRs	$ 32,900		$ 32,900		$ 28,200
Residential Mortgage
Amortized Cost:
Balance at beginning of period	36,062	$ 38,692	38,745	$ 39,267
Originations of MSRs	2,637	4,319	6,905	8,569
Amortization	(2,661)	(4,129)	(9,612)	(8,954)
Balance at end of period	36,038	38,882	36,038	38,882
Servicing Asset [Abstract]
Beginning balance	6,600	7,700	10,500	0
Reduction (addition) to valuation allowance	(3,500)	1,500	(7,400)	9,200
Ending balance	3,100	9,200	3,100	9,200
Net MSRs at end of period	$ 32,938	$ 29,682	$ 32,938	$ 29,682