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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reserve for Unfunded Commitments [Roll Forward]
Balance, beginning of period	$ 4,129	$ 3,495	$ 3,963	$ 3,611
Net charge to other expense	1	321	167	205
Balance, end of period	4,130	3,816	4,130	3,816
Unfunded loan and lease commitments	$ 5,077,579	$ 4,479,108	$ 5,077,579	$ 4,479,108