Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Computation of Basic and Diluted Shares
Net income	$ 4,319	$ 2,504	$ 12,031	$ 8,487
Weighted average shares outstanding – basic	7,374,600	7,166,020	7,347,376	7,138,878
Dilutive potential shares from unvested restricted shares	183,536	157,225	239,112	157,966
Dilutive potential shares from stock options				4,170
Weighted average shares outstanding – diluted	7,558,136	7,323,245	7,586,488	7,301,014
Earnings per share:
Basic	$ 0.59	$ 0.35	$ 1.64	$ 1.19
Diluted	$ 0.57	$ 0.34	$ 1.59	$ 1.16