Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Income
Interest and fees on loans	$ 125,752	$ 118,138	$ 115,107
Interest on investment securities:
Taxable	14,387	12,392	10,830
Tax-exempt	2,706	1,622	1,137
Interest Income, Deposits with Financial Institutions	85	0	0
Total Interest Income	142,930	132,152	127,074
Interest Expense
Interest on deposits	14,826	12,052	10,886
Interest on short-term borrowings	1,214	472	327
Interest on long-term debt	765	683	617
Total Interest Expense	16,805	13,207	11,830
Net Interest Income	126,125	118,945	115,244
Provision for loan losses	3,006	4,395	6,988
Net Interest Income After Provision for Loan Losses	123,119	114,550	108,256
Non-interest Income
Gains on sale of investment securities	4,476	3,513	2,130
Service charges	28,574	26,703	26,316
Bankcard revenue	17,120	16,515	15,894
Trust and investment management fee income	6,269	5,573	5,124
Bank owned life insurance	4,212	3,326	3,374
Gain on sale of insurance division	0	0	11,084
Other income	2,956	3,195	3,284
Total Non-interest Income	63,607	58,825	67,206
Non-interest Expense
Salaries and employee benefits	51,057	50,883	47,847
Occupancy related expenses	9,557	10,119	9,756
Equipment and software related expenses	7,732	7,211	6,609
FDIC insurance expense	1,348	1,622	1,794
Advertising	2,914	2,606	2,446
Bankcard expenses	3,924	4,458	4,119
Postage, delivery, and statement mailings	2,094	2,080	2,123
Office supplies	1,437	1,364	1,350
Legal and professional fees	1,956	1,882	1,534
Telecommunications	1,988	1,813	1,765
Repossessed asset losses, net of expenses	735	890	1,264
Merger related costs	0	0	598
Other expenses	11,239	11,236	11,746
Total Non-interest Expense	95,981	96,164	92,951
Income Before Income Taxes	90,745	77,211	82,511
Income tax expense	36,435	25,083	28,414
Net Income Available to Common Shareholders	$ 54,310	$ 52,128	$ 54,097
Average shares outstanding, basic	15,412	14,900	15,123
Effect of dilutive securities	24	13	48
Average shares outstanding, diluted	15,436	14,913	15,171
Basic earnings per common share	$ 3.49	$ 3.46	$ 3.54
Diluted earnings per common share	3.48	3.45	3.53
Dividends declared per common share	$ 1.78	$ 1.72	$ 1.68