Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Interest income:
Interest and fees on loans	$ 83,575		$ 82,453	$ 81,468
Interest and dividends on investment securities	21,875		18,602	17,463
Total interest income	105,450		101,055	98,931
Interest expense:
Deposits	7,306		6,366	6,600
Short-term borrowings	1,081		$ 915	$ 737
Long-term borrowings	1,750
Total interest expense	10,137		$ 7,281	$ 7,337
Net interest income	95,313		93,774	91,594
Provision for loan losses	7,381		7,789	9,079
Net interest income after provision for loan losses	87,932		85,985	82,515
Noninterest income:
Service charges on deposits	7,742		8,954	9,948
Insurance income	5,166		2,399	262
ATM and debit card	5,084		4,963	5,098
Investment advisory	2,193		2,138	2,345
Company owned life insurance	1,962		1,753	1,706
Investments in limited partnerships	895		1,103	857
Loan servicing	503		568	570
Net gain on sale of loans held for sale	249		313	117
Net gain on disposal of investment securities	1,988		2,041	1,226
Net gain (loss) on sale and disposal of other assets	27		69	(103)
Amortization of tax credit investment	(390)		(2,323)
Other	4,918		3,372	2,807
Total noninterest income	30,337		25,350	24,833
Noninterest expense:
Salaries and employee benefits	42,439		38,595	37,828
Occupancy and equipment	13,856		12,829	12,366
Professional services	4,502		4,760	3,836
Computer and data processing	3,186		3,016	2,848
Supplies and postage	2,155		2,053	2,342
FDIC assessments	1,719		1,592	1,464
Advertising and promotions	1,120		805	896
Goodwill impairment	751
Other	9,665		8,705	7,861
Total noninterest expense	79,393	[1]	72,355	69,441
Income before income taxes	38,876		38,980	37,907
Income tax expense	10,539		9,625	12,377
Net income	28,337		29,355	25,530
Preferred stock dividends	1,462		1,462	1,466
Net income available to common shareholders	$ 26,875		$ 27,893	$ 24,064
Earnings per common share (Note 16):
Basic	$ 1.91		$ 2.01	$ 1.75
Diluted	1.90		2.00	1.75
Cash dividends declared per common share	$ 0.80		$ 0.77	$ 0.74
Weighted average common shares outstanding:
Basic	14,081		13,893	13,739
Diluted	14,135		13,946	13,784

[1] Insurance segment includes goodwill impairment of $751 thousand