Share-Based Compensation - Textual (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 83,000	$ 149,000
Options granted (in shares)	91,150		91,150
Weighted average grant date fair value of options granted in period (in dollars per share)			$ 8.02
Weighted average grant date fair value of options granted in period			$ 3.41
Options exercised during period			65,450
Options exercised, total intrinsic value			87,000
Cash received from exercise of stock options			361,000	680,000
Tax benefit realized from exercise of stock options			25,000	117,000
Unrecognized compensation cost related to non-vested share-based compensation arrangements	405,000		405,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	19,000	47,000
Tax benefit of stock option compensation expense	$ 3,000	$ 9,000	$ 14,000	$ 27,000
Weighted average period to recognize unrecognized share-based compensation cost			2 years 29 days