Allowance for Loan and Lease Loss and Credit Quality (Summary Of Reserve For Unfunded Commitments Activity) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reserve for Unfunded Commitments [Roll Forward]
Balance, beginning of period	$ 4,654	$ 4,129	$ 4,523	$ 3,963
Net charge to other expense	203	1	334	167
Balance, end of period	4,857	4,130	4,857	4,130
Unfunded loan and lease commitments	$ 5,587,294	$ 5,077,579	$ 5,587,294	$ 5,077,579