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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reserve for Unfunded Commitments [Roll Forward]
Balance, beginning of period	$ 3,495	$ 3,482	$ 3,611	$ 3,574
Net charge to other expense	321	49	205	(43)
Balance, end of period	3,816	3,531	3,816	3,531
Unfunded loan commitments	$ 4,479,108	$ 4,006,031	$ 4,479,108	$ 4,006,031