Income Taxes (Schedule Of Reconciliation Of Income Taxes) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory Federal income tax rate	35.00%	35.00%	35.00%
State tax, net of Federal income tax	4.00%	4.00%	4.00%
Revaluation effect of the Tax Cuts and Jobs Act of 2017	(8.20%)	(0.00%)	(0.00%)
Tax-exempt income	(2.00%)	(1.80%)	(1.80%)
BOLI	(1.10%)	(0.90%)	(1.10%)
Tax credits	(0.40%)	(0.30%)	(0.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Percent	0.40%	0.00%	0.00%
Other	0.40%	0.30%	(0.10%)
Effective income tax rate	28.10%	36.30%	35.90%