Allowance for Loan and Lease Loss and Credit Quality (Summary Of Reserve For Unfunded Commitments Activity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reserve for Unfunded Commitments [Roll Forward]
Balance, beginning of period	$ 4,857	$ 4,130	$ 4,523	$ 3,963
Net charge to other expense	228	164	562	331
Balance, end of period	5,085	4,294	5,085	4,294
Unfunded loan and lease commitments	$ 5,744,307	$ 5,244,832	$ 5,744,307	$ 5,244,832