Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 9,339	$ 13,176	$ 10,149	$ 13,898
Restructured loans (accruing)	99,902	61,621	98,969	53,468
Total	109,241	74,797	109,118	67,366
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	7,477	8,938	7,888	9,800
Restructured loans (accruing)	83,493	42,930	81,543	36,567
Total	90,970	51,868	89,431	46,367
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	1,862	4,238	2,261	4,098
Restructured loans (accruing)	16,409	18,691	17,426	16,901
Total	$ 18,271	$ 22,929	$ 19,687	$ 20,999