Employee Benefit and Deferred Compensation Plans (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 01, 2013	Jan. 31, 2013	Jan. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]
Share based compensation arrangement by share based payment stock option granted, vested and exercisable (percent)		33.33%	33.33%
Treasury shares reissued (shares)						84,712
Total stock-based compensation expense				$ 885	$ 329	$ 1,840	$ 937
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period	11,557					11,557
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Share-based Compensation Arrangements by Share-based Payment Award, Options, Other Share Increase (Decrease) in Period, Weighted Average Exercise Price	$ 21.16					$ 21.16
Share Based Payment Arrangements, Stock Option Awards, Weighted Average Remaining Contractual Life of Options Assumed in Acquisition	2 years 18 days
Share Based Payment Arrangements, Stock Option Awards, Fair Value of Options Assumed in Acquisition	$ 68