Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Earnings Per Share [Abstract]
Net income (loss)	$ 1,562	$ 1,259	$ 1,354	$ 490	$ (12,573)	$ 394	$ 1,233	$ 472	$ 4,665		$ (10,474)		$ 3,460
Weighted-average common shares:
Outstanding									10,737,804		10,684,133		10,635,939
Equivalents									57,170	[1]	56,469	[1]	69,875	[1]
Total									10,794,974		10,740,602		10,705,814
Earnings (loss) per share:
Basic	$ 0.15	$ 0.12	$ 0.13	$ 0.05	$ (1.17)	$ 0.04	$ 0.12	$ 0.04	$ 0.43		$ (0.98)		$ 0.33
Diluted	$ 0.14	$ 0.12	$ 0.13	$ 0.05	$ (1.17)	$ 0.04	$ 0.11	$ 0.04	$ 0.43		$ (0.98)		$ 0.32
Number of anti-dilutive stock options excluded from the diluted earnings (loss) per share calculation									406,691		548,794		673,940
Weighted-average exercise price of anti-dilutive option shares									$ 14.07		$ 13.86		$ 13.39

[1] (1)Assumes exercise of dilutive stock options, a portion of the unearned restricted stock awards, and treasury shares held in Rabbi Trust accounts.