Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net income	$ 64,694	$ 67,374
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and (accretion), net	6,225	2,911
(Recovery of) provision for credit losses	(3,165)	10,248
Depreciation of premises and equipment	4,373	4,285
Deferred income tax expense	1,805	1,035
Net periodic employee benefit cost	443	542
Pension contributions	(1,000)	(450)
Gains on sale of investment securities, net	763	(1,642)
Gain from the sale of VISA shares	0	(17,837)
Stock-compensation expense	2,430	2,455
Excess tax benefit from stock-compensation expense	(397)	(160)
Increase in value of bank-owned life insurance	(3,147)	(3,611)
Loans originated for sale	(28,601)	(19,345)
Proceeds from the sale of loans originated for sale	28,591	19,790
Gain on sale of loans	(271)	(277)
Change in accrued interest receivable	(431)	(5,058)
Change in other assets	(6,486)	(14,550)
Change in other liabilities	9,393	13,398
Net Cash Provided by Operating Activities	73,693	62,392
Investing Activities
Net decrease (increase) in loans	99,342	(45,316)
Purchases	438,625	393,932
Proceeds from sales	0	28,548
Proceeds from maturities and calls	213,579	96,021
Purchases	(116)	(2,173)
Proceeds from sales	4,756	2,386
Proceeds from the sale of VISA shares	0	17,837
Purchases of premises and equipment	(2,931)	(4,351)
Proceeds from the disposals of premises and equipment	367	134
Proceeds from the disposition of assets held-for-sale	0	440
Proceeds from bank-owned life insurance policies	2,148	1,940
Payments for low income housing tax credits	(1,692)	(807)
Net Cash Used in Investing Activities	(123,172)	(299,273)
Financing Activities
Net increase in non-interest-bearing deposits	134,474	256,223
Net increase in interest-bearing deposits	100,931	88,425
Net increase in short-term borrowings	686	68,611
Repayment of long-term debt	0	(4,124)
Purchases of treasury stock	(48,321)	(31,600)
Proceeds from exercise of stock options	622	223
Lease payments	(632)	(652)
Dividends paid	(27,391)	(27,651)
Net Cash Provided by Financing Activities	160,369	349,455
Increase in Cash and Cash Equivalents	110,890	112,574
Cash and cash equivalents at beginning of period	528,659	140,144
Cash and Cash Equivalents at End of Period	639,549	252,718
Supplemental Cash Flow Information:
Cash paid for interest	9,111	20,491
Cash paid for income taxes	$ 14,400	$ 21,975