Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets [Abstract]
Cash and due from banks	$ 87,658	$ 88,658
Interest-bearing deposits in depository institutions	285,596	51,486
Cash and Cash Equivalents	373,254	140,144
Investment securities available for sale, at fair value	1,055,185	810,106
Investment securities, held-to-maturity, at amortized cost	0	49,036
Securities held-to-maturity, Estimated Fair Value	0	50,598
Other securities	26,144	28,490
Total Investment Securities	1,081,329	887,632
Gross loans	3,665,596	3,616,099
Allowance for credit losses	(25,199)	(11,589)
Net Loans	3,640,397	3,604,510
Bank owned life insurance	116,746	115,261
Premises and equipment, net	77,991	76,965
Accrued interest receivable	14,200	11,569
Net deferred tax asset	0	6,669
Goodwill and other intangible assets, net	119,417	120,241
Other assets	105,438	55,765
Total Assets	5,528,772	5,018,756
Deposits:
Noninterest-bearing	1,079,469	805,087
Interest-bearing:
Demand deposits	921,761	896,465
Savings deposits	1,067,254	1,009,771
Time deposits	1,342,631	1,364,571
Total Deposits	4,411,115	4,075,894
Securities sold under agreements to repurchase	282,676	211,255
Long-term debt	0	4,056
Net deferred tax liability	2,598	0
Other liabilities	138,633	69,568
Total Liabilities	$ 4,835,022	$ 4,360,773
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, par value (in dollars per share)	$ 25	$ 25
Preferred stock, shares authorized (in shares)	500,000	500,000
Preferred stock, shares issued (in shares)	0	0
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	19,047,548	19,047,548
Common stock, treasury shares (in shares)	2,970,815	2,744,109
Preferred Stock	$ 0	$ 0
Common Stock	47,619	47,619
Capital surplus	169,881	170,309
Retained earnings	565,804	539,253
Cost of common stock in treasury	(120,583)	(105,038)
Accumulated other comprehensive income:
Unrealized gain on securities available-for-sale	37,299	12,110
Underfunded pension liability	(6,270)	(6,270)
Total Accumulated Other Comprehensive Income	31,029	5,840
Total Shareholders’ Equity	693,750	657,983
Total Liabilities and Shareholders’ Equity	$ 5,528,772	$ 5,018,756