Loans And Allowance For Loan Losses (Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	$ 10,719,773	$ 9,714,466
Impaired Financing Receivable, Recorded Investment	103,881	116,918
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	153,236	165,047
Impaired Financing Receivable, Related Allowance	10,296	7,485
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	6,281,851	5,624,965
Impaired Financing Receivable, Recorded Investment	73,698	80,807
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	90,256	100,291
Impaired Financing Receivable, Related Allowance	7,689	5,434
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	4,437,922	4,089,501
Impaired Financing Receivable, Recorded Investment	30,183	36,111
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	62,980	64,756
Impaired Financing Receivable, Related Allowance	$ 2,607	$ 2,051