Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 13,176	$ 19,034	$ 13,898	$ 23,723
Restructured loans (accruing)	61,621	48,454	53,468	46,476
Total	74,797	67,488	67,366	70,199
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	8,938	15,106	9,800	19,387
Restructured loans (accruing)	42,930	31,372	36,567	29,117
Total	51,868	46,478	46,367	48,504
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	4,238	3,928	4,098	4,336
Restructured loans (accruing)	18,691	17,082	16,901	17,359
Total	$ 22,929	$ 21,010	$ 20,999	$ 21,695