CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Operating activities
Net income	$ 41,301	$ 47,315
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recapture of) credit losses	(5,815)	3,988
Depreciation and amortization	8,107	8,233
Stock-based compensation expense	3,507	2,842
Pension expense (income)	625	850
Net amortization (accretion) on investment securities	4,092	9,136
Net (gain) loss on sales of investment securities	(3)	166
Unrealized gain (loss) on equity securities	199	(112)
Originations of loans held for sale	(98,958)	(206,222)
Net gains from sales of loans held for sale	(3,872)	(9,454)
Proceeds from sales of loans held for sale	113,939	220,374
Deferred income taxes	334	3,303
Operating Lease, Right-of-Use Asset, Amortization Expense	1,899	1,851
Payments for operating leases	(1,942)	(1,790)
Decrease (increase) cash surrender value of life insurance	652	479
Decrease (increase) in interest receivable	1,846	(777)
(Decrease) increase in interest payable	164	(518)
Decrease (increase) in other assets	52,590	117,134
(Decrease) increase in other liabilities	26,454	(48,806)
Net cash provided by (used in) operating activities	143,815	147,034
Proceeds from Sale of Debt Securities, Available-for-sale	5,003	50,451
Investing activities
Proceeds from calls, paydowns and maturities of securities available-for-sale	232,267	279,426
Payments to Acquire Debt Securities, Available-for-sale	173,954	665,723
Proceeds from calls, paydowns and maturities of securities held-to-maturity	5,906	10,799
Payments to Acquire Held-to-maturity Securities	0	(1,000)
Payments to Acquire Other Investments	11,799	992
Proceeds from Maturities, Prepayments and Calls of Other Investments	8	2,488
Net decrease (increase) in interest-bearing deposits with other banks	(12,336)	1,125
Net decrease (increase) in loans and leases	49,580	(40,390)
Proceeds from disposal of other real estate owned	98	433
Purchases of premises and equipment	(3,181)	(2,717)
Net change in operating leases	(12,085)	0
Net cash provided by (used in) investing activities	82,823	(366,100)
Financing activities
Net (decrease) increase in total deposits	(53,046)	416,066
Net (decrease) increase in short-term borrowings	(111,203)	14,793
Payments of long-term debt	30,183	192,508
Cash dividends paid on common stock	(21,986)	(22,200)
Treasury stock purchase	0	17,982
Proceeds from exercise of stock options	177	34
Net cash provided by (used in) financing activities	(216,241)	198,203
Cash and due from banks:
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	10,397	(20,863)
Cash and due from bank at beginning of period	220,031	231,054	$ 231,054
Cash and due from bank at end of period	230,428	210,191	220,031
Supplemental Disclosures
Interest Paid	7,321	9,252
Income Taxes Paid	170	147
Supplemental schedule for investing activities
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets, Net Of Purchase Consideration	1,028
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(238)		(121,901)
Goodwill	(790)	$ 0	$ 63,000
Proceeds from Life Insurance Policy	$ 3,316