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, 2013	$ 280,506	$ 91,332	$ 62,417	$ 172,602	$ (9,955)	$ (35,890)
Beginning balance, shares at Dec. 31, 2013		16,287,812
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,806	$ 0	0	10,806	0	0
Other comprehensive income, net of income tax	3,307	0	0	0	3,307	0
Cash dividends declared ($0.40 per share)	(6,497)	0	0	(6,497)	0	0
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	1,387	$ 0	27	0	0	1,360
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs, shares		69,628
Exercise of stock options	24	$ 0	(3)	0	0	27
Exercise of stock options, shares		1,500
Repurchase of cancelled restricted stock awards	0	$ 0	235	0	0	(235)
Repurchase of cancelled restricted stock awards, shares		(13,625)
Stock-based compensation	514	$ 0	514	0	0	0
Net tax deficiency on stock-based compensation	(2)	0	(2)	0	0	0
Purchases of treasury stock	(3,258)	$ 0	0	0	0	(3,258)
Purchases of treasury stock, shares		(171,124)
Restricted stock awards granted	0	$ 0	(1,349)	0	0	1,349
Restricted stock awards granted, shares		74,304
Ending balance at Jun. 30, 2014	286,787	$ 91,332	61,839	176,911	(6,648)	(36,647)
Ending balance, shares at Jun. 30, 2014		16,248,495
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	12,582	$ 0	0	12,582	0	0
Other comprehensive income, net of income tax	(708)	0	0	0	(708)	0
Cash dividends declared ($0.40 per share)	(7,902)	0	0	(7,902)	0	0
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	1,250	$ 0	30	(1)	0	1,221
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs, shares		63,502
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	241	$ 0	(27)	0	0	268
Exercise of stock options, shares		14,666
Repurchase of cancelled restricted stock awards	0	$ 0	277	0	0	(277)
Repurchase of cancelled restricted stock awards, shares		(17,684)
Stock-based compensation	813	$ 0	813	0	0	0
Purchases of treasury stock	(11,310)	$ 0	0	0	0	(11,310)
Purchases of treasury stock, shares		(575,771)
Restricted stock awards granted	0	$ 0	(1,195)	0	0	1,195
Restricted stock awards granted, shares		65,755
Ending balance at Jun. 30, 2015	$ 356,186	$ 110,271	$ 120,605	$ 186,530	$ (15,170)	$ (46,050)
Ending balance, shares at Jun. 30, 2015	19,559,941	19,559,941