Income Taxes, Deferred Tax Assets and Liabilities Resulted in Deferred Taxes Table (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Gross deferred tax assets:
Allowance for loan losses	$ 83,378	$ 79,142
Allowance for other losses	8,933	10,558
Accrued liabilities	14,089	2,842
Deferred compensation	28,429	30,246
Tax Credit Carryforward, Amount	8,849	0
Benefit of state tax losses and credit carryforwards	9,068	7,476
Nonaccrual interest	901	891
Deferred Tax Assets, Partnerships	2,365	0
Lease liability	6,785	7,390
Net unrealized losses on AFS securities	48,632	80,148
Net unrealized losses on pension and postretirement benefits	8,506	14,803
Other	9,403	4,545
Total deferred tax assets	229,338	238,041
Gross deferred tax liabilities
Prepaid expenses	66,381	64,480
Goodwill	22,161	23,119
Mortgage banking activities	20,799	20,145
Deferred loan fee income	8,097	4,269
State deferred taxes	1,387	1,389
Lease financing	15,297	3,145
Bank premises and equipment	20,389	20,860
Purchase accounting	7,898	10,381
Deferred Tax Liability, Basis Difference From Equity Securities and Other Investments	7,593	5,582
Other	1,207	821
Total deferred tax liabilities	171,209	154,191
Net deferred tax assets	$ 58,129	$ 83,850