CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2013	$ 231,096	$ 47,783	$ 195,660	$ (12,347)
Beginning Balance (in shares) at Dec. 31, 2013		7,579,913
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,715		5,715
Other comprehensive income, net of tax	769			769
Stock-based compensation expense	176	176
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		18,174
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit	118	118
Common stock repurchased (in shares)		(113,527)
Common stock repurchased	(4,393)	(4,393)
Cash dividends declared ($0.27 and $0.30 per share)	(2,012)		(2,012)
Ending Balance at Mar. 31, 2014	231,469	43,684	199,363	(11,578)
Ending Balance (in shares) at Mar. 31, 2014		7,484,560
Beginning Balance at Dec. 31, 2014	245,109	41,555	211,979	(8,425)
Beginning Balance (in shares) at Dec. 31, 2014		7,426,222
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,611		5,611
Other comprehensive income, net of tax	2,974			2,974
Stock-based compensation expense	198	198
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		12,707
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit	136	136
Cash dividends declared ($0.27 and $0.30 per share)	(2,229)		(2,229)
Ending Balance at Mar. 31, 2015	$ 251,799	$ 41,889	$ 215,361	$ (5,451)
Ending Balance (in shares) at Mar. 31, 2015		7,438,929