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, 2017	Mar. 31, 2016
Reserve for Unfunded Commitments [Roll Forward]
Balance, beginning of period	$ 3,611	$ 3,574
Net charge to other expense	(116)	(92)
Balance, end of period	3,495	3,482
Unfunded loan commitments	$ 4,215,048	$ 3,703,352