Income Taxes (Reconciliation Of Statutory Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Statutory federal income tax rate	21.00%	35.00%	35.00%
State and local income taxes, net of federal income tax benefit	(0.80%)	2.00%	0.90%
Tax-exempt income, net of disallowed cost of funding	(5.80%)	(10.20%)	(11.80%)
BOLI income	(1.20%)	(1.20%)	(0.90%)
Excess tax benefit of stock-based compensation	(0.90%)	(1.70%)	(0.90%)
Impact of cost segregation study	(1.50%)
Impact of federal tax reform on deferred taxes		(2.00%)
Other	0.10%	0.10%	0.40%
Total	10.90%	22.00%	22.70%