Mortgage Banking - Capitalized Mortgage and Valuation Allowance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Mortgage servicing assets:
Balance at beginning of period	$ 22,244	$ 21,666
Loans sold, servicing retained	1,348	2,374
Amortization	(1,403)	(2,344)
Carrying value before valuation allowance at end of period	22,189	21,696
Valuation allowance:
Balance at beginning of period	(2,707)	(8,513)
Impairment recovery (charges)	1,233	5,320
Balance at end of period	(1,474)	(3,193)
Net carrying value of MSRs at end of period	20,715	18,503
Fair value of MSRs at end of period	$ 25,996	$ 18,695