Income Taxes, Deferred Tax Assets and Liabilities Resulted in Deferred Taxes Table (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gross deferred tax assets:
Allowance for loan losses	$ 79,142	$ 72,199
Allowance for other losses	10,558	12,704
Accrued liabilities	2,842	4,285
Deferred compensation	30,246	31,896
Benefit of state tax losses and credit carryforwards	7,476	6,245
Nonaccrual interest	891	1,374
Lease liability	7,390	12,954
Net unrealized losses on AFS securities	80,148	1,989
Net unrealized losses on pension and postretirement benefits	14,803	1,308
Other	4,545	3,806
Total deferred tax assets	238,041	148,760
Valuation allowance for deferred tax assets	0	0	$ (251)
Gross deferred tax liabilities
Prepaid expenses	64,480	61,826
Goodwill	23,119	22,785
Mortgage banking activities	20,145	14,382
Deferred loan fee income	4,269	7,848
State deferred taxes	1,389	1,234
Lease financing	3,145	0
Bank premises and equipment	20,860	20,705
Purchase accounting	10,381	11,500
Deferred Tax Liability, Basis Difference From Equity Securities and Other Investments	5,582	2,597
Other	821	667
Total deferred tax liabilities	154,191	143,544
Net deferred tax assets	$ 83,850	$ 5,216