CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2013		7,579,913
Beginning Balance at Dec. 31, 2013	$ 231,096	$ 47,783	$ 195,660	$ (12,347)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	12,031		12,031
Other comprehensive income, net of tax	5,173			5,173
Stock-based compensation expense	431	$ 431
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		22,887
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit	152	$ 152
Common stock repurchased (in shares)		(181,355)
Common stock repurchased	(7,155)	$ (7,155)
Cash dividends declared ($0.54 and $0.60 per share)	(4,008)		(4,008)
Ending Balance (in shares) at Jun. 30, 2014		7,421,445
Ending Balance at Jun. 30, 2014	237,720	$ 41,211	203,683	(7,174)
Beginning Balance (in shares) at Dec. 31, 2014		7,426,222
Beginning Balance at Dec. 31, 2014	245,109	$ 41,555	211,979	(8,425)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	12,804		12,804
Other comprehensive income, net of tax	737			737
Stock-based compensation expense	410	$ 410
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		23,423
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit	375	$ 375
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(421)	$ (421)
Cash dividends declared ($0.54 and $0.60 per share)	(4,474)		(4,474)
Ending Balance (in shares) at Jun. 30, 2015		7,449,645
Ending Balance at Jun. 30, 2015	$ 254,540	$ 41,919	$ 220,309	$ (7,688)