Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 21,429	$ 29,733
Restructured loans (accruing)	49,353	35,066
Average impaired loans	70,782	64,799
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	17,294	24,284
Restructured loans (accruing)	32,295	16,671
Average impaired loans	49,589	40,955
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	4,135	5,449
Restructured loans (accruing)	17,058	18,395
Average impaired loans	$ 21,193	$ 23,844