Employee Benefit and Deferred Compensation Plans (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended		9 Months Ended				1 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Time-based restricted stock [Member]	Sep. 30, 2012 Performance-based restricted stock [Member]	Apr. 30, 2012 Stock compensation plan [Member]
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Number of shares awarded							7,500	34,000	9,684
Percentage earned upon completion exercisable years, service measured from grant date					100.00%				100.00%
Fair value of the restricted stock grants					$ 14.96	$ 16.91			$ 15.49
Employee Benefit and Deferred Compensation Plans (Additional Textual) [Abstract]
Share based compensation arrangement by share based payment stock option granted, vested and exercisable, percentage	33.33%	33.33%
Share based compensation arrangement by share based payment stock option granted, vested and exercisable equal installments					one, two and three years
Treasury shares reissued					54,344
Total stock-based compensation expense			$ 329	$ 299	$ 937	$ 904