Income Taxes (Summary Of Provision For Income Taxes) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Current, Federal	$ 15,053,000	$ 15,398,000	$ 17,086,000
Current, State	4,488,000	3,889,000	4,439,000
Current income taxes, total	19,541,000	19,287,000	21,525,000
Deferred, Federal	296,000	323,000	(1,988,000)
Deferred, State	(181,000)	68,000	(544,000)
Tax Provision	$ 19,656,000	$ 19,678,000	$ 18,993,000