Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 14,406	$ 26,559	$ 14,265	$ 26,093
Restructured loans (accruing)	50,545	46,072	49,324	45,476
Total	64,951	72,631	63,589	71,569
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	9,867	22,098	10,238	21,551
Restructured loans (accruing)	34,765	28,775	33,333	27,977
Total	44,632	50,873	43,571	49,528
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	4,539	4,461	4,027	4,542
Restructured loans (accruing)	15,780	17,297	15,991	17,499
Total	$ 20,319	$ 21,758	$ 20,018	$ 22,041