Income Taxes - Significant Components of The Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Deferred tax assets
Allowance for credit losses	$ 50,421	$ 50,712
Loans	2,602	2,855
Deferred compensation	10,777	14,522
Net unrealized losses on securities	35,769	3,545
Impairment of assets	394	392
Net operating loss carryforwards	1,035	1,211
Investment in partnerships	930	890
Lease liabilities under operating leases	15,423	17,106
Other	4,179	3,241
Total deferred tax assets	121,530	94,474
Deferred tax liabilities
Fixed assets	5,734	5,339
Mortgage servicing rights	21,470	20,779
Junior subordinated debt	2,093	2,130
Intangibles	3,005	3,177
Lease right-of-use asset	14,696	16,209
Other	1,722	1,607
Total deferred tax liabilities	48,720	49,241
Net deferred tax assets	$ 72,810	$ 45,233