Income Taxes (Schedule Of Reconciliation Of Income Taxes) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Statutory Federal income tax rate	35.00%	35.00%	35.00%
State tax net of Federal income tax	4.40%	3.80%	2.50%
Tax-exempt income	(3.00%)	(3.70%)	(13.60%)
Tax credits	(1.10%)	(1.50%)	(5.50%)
Other	(0.90%)	(0.60%)	(1.40%)
Effective income tax rate	34.40%	33.00%	17.00%