Allowance for Loan and Lease Loss and Credit Quality (Summary Of Reserve For Unfunded Commitments Activity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reserve for Unfunded Commitments [Roll Forward]
Balance, beginning of period	$ 4,523	$ 3,963
Net charge to other expense	131	166
Balance, end of period	4,654	4,129
Unfunded loan and lease commitments	$ 5,510,974	$ 5,085,021