Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2014	$ 284,554	$ 91,332	$ 62,980	$ 181,851	$ (14,462)	$ (37,147)
Beginning balance, shares at Dec. 31, 2014		16,221,607
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,116	$ 0	0	6,116	0	0
Other comprehensive income, net of income tax	1,300	0	0	0	1,300	0
Cash dividends declared ($0.20 per share)	(3,991)	0	0	(3,991)	0	0
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	695	$ 0	18	0	0	677
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs, shares		35,262
Issuance of common stock, acquisition	76,666	$ 18,939	57,727	0	0	0
Issuance of common stock, acquisition (shares)		3,787,866
Exercise of stock options	66	$ 0	(7)	0	0	73
Exercise of stock options, shares		4,000
Repurchase of cancelled restricted stock awards	0	$ 0	183	0	0	(183)
Repurchase of cancelled restricted stock awards, shares		(12,375)
Stock-based compensation	412	$ 0	412	0	0	0
Purchases of treasury stock	(5,424)	$ 0	0	0	0	(5,424)
Purchases of treasury stock, shares		(281,291)
Restricted stock awards granted	0	$ 0	(1,195)	0	0	1,195
Restricted stock awards granted, shares		65,755
Ending balance at Mar. 31, 2015	360,394	$ 110,271	120,118	183,976	(13,162)	(40,809)
Ending balance, shares at Mar. 31, 2015		19,820,824
Beginning balance at Dec. 31, 2015	361,574	$ 110,271	121,280	193,446	(16,708)	(46,715)
Beginning balance, shares at Dec. 31, 2015		19,530,930
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,289	$ 0	0	7,289	0	0
Other comprehensive income, net of income tax	1,227	0	0	0	1,227	0
Cash dividends declared ($0.20 per share)	(3,908)	0	0	(3,908)	0	0
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	617	$ 0	8	0	0	609
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs, shares		30,121
Exercise of stock options	238	$ 0	(27)	0	0	265
Exercise of stock options, shares		14,167
Repurchase of cancelled restricted stock awards	0	$ 0	241	0	0	(241)
Repurchase of cancelled restricted stock awards, shares		(14,250)
Stock-based compensation	451	$ 0	451	0	0	0
Net tax benefit/deficiency on stock-based compensation	36	0	36	0	0	0
Purchases of treasury stock	(521)	$ 0	0	0	0	(521)
Purchases of treasury stock, shares		(26,750)
Restricted stock awards granted	0	$ 0	(1,083)	0	0	1,083
Restricted stock awards granted, shares		58,580
Ending balance at Mar. 31, 2016	$ 367,003	$ 110,271	$ 120,906	$ 196,827	$ (15,481)	$ (45,520)
Ending balance, shares at Mar. 31, 2016		19,592,798