Loans And Allowance For Credit Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at start of period	$ 159,932
Provision	12,463
Loans charged off	14,731
Less recoveries on loans	3,018
Allowance for Loan and Lease Losses Write-offs, Net, Total	11,713
Balance at end of period	160,682
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at start of period	92,869
Provision	1,168
Loans charged off	527
Less recoveries on loans	133
Allowance for Loan and Lease Losses Write-offs, Net, Total	394
Balance at end of period	93,643
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at start of period	67,063
Provision	11,295
Loans charged off	14,204
Less recoveries on loans	2,885
Allowance for Loan and Lease Losses Write-offs, Net, Total	11,319
Balance at end of period	$ 67,039