Income Taxes - Significant Components of The Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Deferred tax assets
Allowance for credit losses	$ 53,078	$ 52,551
Loans	1,932	2,518
Deferred compensation	14,381	14,447
Net unrealized losses on securities	66,442	70,999
Impairment of assets	135	316
Net operating loss carryforwards	0	497
Investment in partnerships	1,481	1,164
Lease liabilities under operating leases	13,505	14,641
Other	5,703	3,523
Total deferred tax assets	156,657	160,656
Deferred tax liabilities
Fixed assets	10,340	10,342
Mortgage servicing rights	21,103	19,624
Junior subordinated debt	1,767	1,948
Intangibles	2,483	2,702
Lease right-of-use asset	12,889	14,018
Other	993	1,614
Total deferred tax liabilities	49,575	50,248
Net deferred tax assets	$ 107,082	$ 110,408