Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Allowance for credit losses	$ 50,712	$ 53,597
Loans	2,855	5,526
Deferred compensation	14,522	13,114
Net unrealized losses on securities	3,545	0
Impairment of assets	392	1,067
Net operating loss carryforwards	1,211	1,857
Investments in partnerships	890	0
Lease liabilities under operating leases	17,106	17,732
Other	3,241	3,539
Total deferred tax assets	94,474	96,432
Deferred tax liabilities
Net unrealized gains on securities	0	8,434
Investment in partnerships	0	793
Fixed assets	5,339	3,285
Mortgage servicing rights	20,779	14,623
Junior subordinated debt	2,130	2,245
Intangibles	3,177	3,882
Lease right-of-use asset	16,209	16,833
Other	1,607	1,672
Total deferred tax liabilities	49,241	51,767
Net deferred tax assets	$ 45,233	$ 44,665