Loans, Allowance for Loan Losses, and Credit Quality Consumer Loans by Credit Quaility Indicator (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Consumer Loans By Credit Quality Indicator [Abstract]
Home equity	$ 1,825,014	$ 2,219,494
Installment	407,074	466,727
Residential mortgage	3,835,591	3,376,697
Total consumer	6,067,679	6,062,918
Performing Financing Receivable [Member]
Consumer Loans By Credit Quality Indicator [Abstract]
Home equity	1,777,421	2,153,103
Installment	404,514	462,016
Residential mortgage	3,758,688	3,276,889
Total consumer	5,940,623	5,892,008
Thirty To Eighty Nine Days Past Due [Member]
Consumer Loans By Credit Quality Indicator [Abstract]
Home equity	10,680	13,538
Installment	1,150	2,109
Residential mortgage	6,118	9,403
Total consumer	17,948	25,050
Potential Problem [Member]
Consumer Loans By Credit Quality Indicator [Abstract]
Home equity	2,113	3,670
Installment	50	111
Residential mortgage	3,312	8,762
Total consumer	5,475	12,543
Impaired [Member]
Consumer Loans By Credit Quality Indicator [Abstract]
Home equity	34,800	49,183
Installment	1,360	2,491
Residential mortgage	67,473	81,643
Total consumer	$ 103,633	$ 133,317