Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2012	$ 284,277	$ 91,332	$ (6,920)	$ 62,101	$ 164,823	$ (27,059)
Beginning balance, shares at Dec. 31, 2012		16,770,232
Net income	10,228				10,228
Other comprehensive income (loss), net of income tax benefit	(6,309)		(6,309)
Cash dividends declared ($0.40 per share)	(6,693)				(6,693)
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	1,363			5	(33)	1,391
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs, shares		79,139
Repurchase of cancelled restricted stock awards				519		(519)
Repurchase of cancelled restricted stock awards, shares		(29,533)
Stock-based compensation	262			262
Net tax deficiency on stock-based compensation	(11)			(11)
Purchases of treasury stock	(3,529)					(3,529)
Purchases of treasury stock, shares		(206,870)
Restricted stock awards granted				(1,174)	(92)	1,266
Restricted stock awards granted, shares		70,041
Ending balance at Jun. 30, 2013	279,588	91,332	(13,229)	61,702	168,233	(28,450)
Ending balance, shares at Jun. 30, 2013		16,683,009
Beginning balance at Dec. 31, 2013	280,506	91,332	(9,955)	62,417	172,602	(35,890)
Beginning balance, shares at Dec. 31, 2013		16,287,812
Net income	10,806				10,806
Other comprehensive income (loss), net of income tax benefit	3,307		3,307
Cash dividends declared ($0.40 per share)	(6,497)				(6,497)
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	1,387			27		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			(3)		27
Exercise of stock options, shares		1,500
Repurchase of cancelled restricted stock awards				235		(235)
Repurchase of cancelled restricted stock awards, shares		(13,625)
Stock-based compensation	514			514
Net tax deficiency on stock-based compensation	(2)			(2)
Purchases of treasury stock	(3,258)					(3,258)
Purchases of treasury stock, shares		(171,124)
Restricted stock awards granted				(1,349)		1,349
Restricted stock awards granted, shares		74,304
Ending balance at Jun. 30, 2014	$ 286,787	$ 91,332	$ (6,648)	$ 61,839	$ 176,911	$ (36,647)
Ending balance, shares at Jun. 30, 2014		16,248,495