Stock-Based Compensation (Details 1) (Stock Options [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options [Member]
Summary of the status of the stock option plan and changes
Shares Outstanding at beginning of year	617,181	556,474	455,698
Shares Granted	82,550	90,300	120,615
Shares Exercised	(39,752)	(28,596)	(17,867)
Shares Forfeited or expired		(997)	(1,972)
Shares Outstanding at end of year	659,979	617,181	556,474
Shares Options exercisable at year-end	432,055	346,509	257,290
Shares available for grant	262,237	140,525	229,616
Weighted average exercise price Outstanding at beginning of year	$ 7.05	$ 6.72	$ 6.76
Weighted average exercise price Granted	$ 13.44	$ 9.05	$ 6.31
Weighted average exercise price Exercised	$ 8.94	$ 6.49	$ 5.36
Weighted average exercise price Forfeited or expired		$ 6.49	$ 5.17
Weighted average exercise price Outstanding at end of year	$ 7.75	$ 7.05	$ 6.72
Weighted average exercise price, Options exercisable	$ 6.74	$ 7.05	$ 7.57
Weighted average fair value of options granted during the year	$ 7.15	$ 5.48	$ 3.82
Weighted Average Remaining Contractual Life, Outstanding	6 years 2 months 12 days	6 years 6 months	6 years 10 months 24 days
Weighted Average Remaining Contractual Life, Options exercisable	5 years 2 months 12 days	5 years 6 months	5 years 6 months