Consolidated Statements Of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities
Net income	$ 71,408,000	$ 64,694,000
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and (accretion), net	8,607,000	6,225,000
Provision for (recovery of) credit losses	(26,000)	(3,165,000)
Depreciation of premises and equipment	4,033,000	4,373,000
Deferred income tax expense	1,181,000	1,805,000
Net periodic employee benefit cost	192,000	443,000
Pension contributions	0	(1,000,000)
Gains on sale of investment securities, net	(1,322,000)	763,000
Stock-compensation expense	2,412,000	2,430,000
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit	(189,000)	397,000
Increase in value of bank-owned life insurance	(3,746,000)	(3,147,000)
Loans originated for sale	(29,139,000)	(28,601,000)
Proceeds from the sale of loans originated for sale	29,422,000	28,591,000
Gain on sale of loans	(283,000)	(271,000)
Change in accrued interest receivable	(1,629,000)	(431,000)
Change in other assets	(11,312,000)	(6,486,000)
Change in other liabilities	9,136,000	9,393,000
Net Cash Provided by Operating Activities	81,767,000	73,693,000
Investing Activities
Net (increase) decrease in loans	(85,289,000)	99,342,000
Purchases	488,401,000	438,625,000
Proceeds from maturities and calls	177,875,000	213,579,000
Purchases	(280,000)	(116,000)
Proceeds from sales	116,000	4,756,000
Purchases of premises and equipment	(1,677,000)	(2,931,000)
Proceeds from the disposals of premises and equipment	189,000	367,000
Proceeds from bank-owned life insurance policies	3,623,000	2,148,000
Payments for low income housing tax credits	(2,144,000)	(1,692,000)
Net Cash Used in Investing Activities	(395,988,000)	(123,172,000)
Financing Activities
Net increase in non-interest-bearing deposits	56,156,000	134,474,000
Net (decrease) increase in interest-bearing deposits	(23,625,000)	100,931,000
Net (decrease) increase in short-term borrowings	(7,651,000)	686,000
Purchases of treasury stock	(20,015,000)	(48,321,000)
Proceeds from exercise of stock options	697,000	622,000
Repayments of Debt and Lease Obligation	(572,000)	(632,000)
Dividends paid	(27,047,000)	(27,391,000)
Net Cash (Used in) Provided by Financing Activities	(22,057,000)	160,369,000
(Decrease) Increase in Cash and Cash Equivalents	(336,278,000)	110,890,000
Cash and cash equivalents at beginning of period	634,631,000	528,659,000
Cash and Cash Equivalents at End of Period	298,353,000	639,549,000
Supplemental Cash Flow Information:
Cash paid for interest	5,299,000	9,111,000
Cash paid for income taxes	$ 17,834,000	$ 14,400,000