Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 26,298	$ 45,378	$ 31,575	$ 45,419
Restructured loans (accruing)	31,620	52,792	35,466	57,817
Total	57,918	98,170	67,041	103,236
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	21,119	38,111	25,784	38,099
Restructured loans (accruing)	13,399	32,970	16,612	37,157
Total	34,518	71,081	42,396	75,256
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	5,179	7,267	5,791	7,320
Restructured loans (accruing)	18,221	19,822	18,854	20,660
Total	$ 23,400	$ 27,089	$ 24,645	$ 27,980