CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2010	$ 19,833	$ 170,472	$ 0	$ 190,305
Balance (in shares) at Dec. 31, 2010	23,767,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	12,993	0	12,993
Dividends declared	0	(7,849)	0	(7,849)
Dividends reinvested in common stock	529	0	0	529
Dividends reinvested in common stock (in shares)	51,000
Stock based compensation	1,718	0	0	1,718
Common stock issued through exercise of incentive stock options	37	0	0	37
Common stock issued through exercise of incentive stock options (in shares)	5,000
Common stock issued for share awards	0	0	0	0
Common stock issued for share awards (in shares)	19,000
Common stock issued	13	0	0	13
Common stock issued (in shares)	1,000
Common stock repurchased	(92)	0	0	(92)
Common stock repurchased (in shares)	(5,000)
Net excess tax benefit from stock options exercised	5	0	0	5
Balance at Dec. 31, 2011	22,043	175,616	0	197,659
Balance (in shares) at Dec. 31, 2011	23,838,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	16,303	0	16,303
Other comprehensive income	0	0	(863)	(863)
Dividends declared	0	(7,896)	0	(7,896)
Dividends reinvested in common stock	493	0	0	493
Dividends reinvested in common stock (in shares)	37,000
Stock based compensation	1,842	0	0	1,842
Common stock issued through exercise of incentive stock options	404	0	0	404
Common stock issued through exercise of incentive stock options (in shares)	55,000
Common stock issued for share awards	0	0	0	0
Common stock issued for share awards (in shares)	45,000
Common stock issued	10	0	0	10
Common stock issued (in shares)	1,000
Common stock repurchased	(143)	0	0	(143)
Common stock repurchased (in shares)	(13,000)
Net excess tax benefit from stock options exercised	39	0	0	39
Balance at Dec. 31, 2012	24,688	184,023	(863)	207,848
Balance (in shares) at Dec. 31, 2012	23,962,000			23,962,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	29,586	0	29,586
Other comprehensive income	0	0	3,457	3,457
Dividends declared	0	(8,647)	0	(8,647)
Dividends reinvested in common stock	475	0	0	475
Dividends reinvested in common stock (in shares)	20,000
Stock based compensation	1,938	0	0	1,938
Common stock issued through exercise of incentive stock options	1,186	0	0	1,186
Common stock issued through exercise of incentive stock options (in shares)	66,000
Common stock issued for share awards	0	0	0	0
Common stock issued for share awards (in shares)	68,000
Common stock issued	10	0	0	10
Common stock issued (in shares)	1,000
Common stock repurchased	(1,600)	0	0	(1,600)
Common stock repurchased (in shares)	(77,000)
Net excess tax benefit from stock options exercised	62	0	0	62
Balance at Dec. 31, 2013	$ 26,759	$ 204,962	$ 2,594	$ 234,315
Balance (in shares) at Dec. 31, 2013	24,040,000			24,040,000