Stock Option Plans - Stock Option Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options outstanding at the beginning of the year	1,118,688	943,000
Options granted	220,500	215,438
Options forfeited	(27,475)	(6,250)
Options exercised	(75,650)	(33,500)
Options outstanding at the end of the year	1,236,063	1,118,688
Options exercisable at the end of the year	771,208	672,125
Common stock available for future grants at the end of the year	38,975	61,500
Granted	$ 13.38	$ 10.47
Forfeited	$ 12.17	$ 6.98
Exercised	$ 6.89	$ 5.13
Outstanding	$ 11.61	$ 10.96
Exercisable	$ 11.64	$ 11.65