Income Taxes, Deferred Tax Assets and Liabilities Resulted in Deferred Taxes Table (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Gross deferred tax assets:
Allowance for loan losses	$ 72,199	$ 88,967
Allowance for other losses	12,704	16,347
Accrued liabilities	4,285	3,776
Deferred compensation	31,896	27,896
Benefit of tax loss and credit carryforwards	6,245	9,789
Nonaccrual interest	1,374	1,763
Deferred Tax Assets, Leasing Arrangements	12,954	13,328
Basis Difference From Equity Securities and Other Investments	0	6,329
Net unrealized losses on AFS securities	1,989	0
Net unrealized losses on pension and postretirement benefits	1,308	9,110
Other	3,806	997
Total deferred tax assets	148,760	178,302
Valuation allowance for deferred tax assets	0	(251)	$ (251)
Total deferred tax assets after valuation allowance	148,760	178,051
Gross deferred tax liabilities
Prepaid expenses	61,826	63,113
Goodwill	22,785	21,698
Mortgage banking activities	14,382	10,403
Deferred loan fee income	7,848	9,799
State deferred taxes	1,234	2,636
Lease financing	0	116
Bank premises and equipment	20,705	30,188
Purchase accounting	11,500	12,658
Deferred Tax Liability, Basis Difference From Equity Securities and Other Investments	2,597	0
Net unrealized gains on AFS securities	0	13,568
Other	667	1,049
Total deferred tax liabilities	143,544	165,228
Net deferred tax assets (liabilities)		$ 12,823
Net deferred tax assets (liabilities)	$ 5,216