Employee Benefit and Stock Plans (Details 3) (Restricted Stock [Member], USD $)	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009
Restricted Stock [Member]
Restricted stock transactions
Outstanding at beginning of year, Shares	402,477	445,831
Granted, Shares	0	51,023
Granted, Weighted Average per Share Grant Date Fair Value	$ 0.00	$ 12.58
Vested, Shares	(10,930)
Vested, Weighted Average per Share Grant Date Fair Value	$ 13.49
Cancelled, Shares	(52,635)	(94,377)
Cancelled, Weighted Average per Share Grant Date Fair Value	$ 15.44	$ 15.36
Outstanding at end of year, Shares	338,912	402,477
Outstanding at end of year, Weighted Average per Share Grant Date Fair Value	$ 15.03	$ 15.09	$ 15.44