Stock-Based Compensation (Details 2) (Stock Options, USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Stock Options
Assumptions used to determine fair value of stock options granted
Dividend yield (as a percent)	0.00%	0.00%
Expected volatility (as a percent)	43.90%	41.80%
Expected life of option	5 years	5 years
Risk-free interest rate (as a percent)	0.70%	0.80%
Fair value of each option on grant date (in dollars per share)	$ 4.72	$ 2.73
Granted (in shares)	4,250	750
Shares
Outstanding at beginning of period (in shares)	21,362
Granted (in shares)	4,250	750
Exercised (in shares)	(10,361)
Expired and forfeited (in shares)	(500)
Outstanding at end of period (in shares)	14,751
Exercisable at end of period (in shares)	5,832
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 6.72
Granted (in dollars per share)	$ 12.56
Exercised (in dollars per share)	$ 6.13
Expired and forfeited (in dollars per share)	$ 12.56
Outstanding at end of period (in dollars per share)	$ 8.62
Exercisable at end of period (in dollars per share)	$ 6.91
Aggregate intrinsic value of all options outstanding	$ 53,000
Aggregate intrinsic value of all options exercisable	$ 31,000