Income Taxes (Reconciliation Of Statutory Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Statutory federal income tax rate	21.00%	21.00%	35.00%
State and local income taxes, net of federal income tax benefit	0.50%	(0.80%)	2.00%
Tax-exempt income, net of disallowed cost of funding	(4.60%)	(5.80%)	(10.20%)
BOLI income	(0.90%)	(1.20%)	(1.20%)
Excess tax benefit of stock-based compensation	(0.10%)	(0.90%)	(1.70%)
Nondeductible officer compensation	0.50%
Impact of cost segregation study		(1.50%)
Impact of federal tax reform on deferred taxes			(2.00%)
Other	0.10%	0.10%	0.10%
Total	16.50%	10.90%	22.00%