Loans and Allowance for Credit Losses Loans Modified Under Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2013 Real-estate - residential mortgage [Member]	Dec. 31, 2012 Real-estate - residential mortgage [Member]	Sep. 30, 2013 Real-estate commercial mortage [Member]	Dec. 31, 2012 Real-estate commercial mortage [Member]	Sep. 30, 2013 Commercial - Secured [Member]	Dec. 31, 2012 Commercial - Secured [Member]	Sep. 30, 2013 Construction - Commercial Residential [Member]	Dec. 31, 2012 Construction - Commercial Residential [Member]	Sep. 30, 2013 Home Equity [Member]	Dec. 31, 2012 Home Equity [Member]	Sep. 30, 2013 Commercial - unsecured [Member]	Dec. 31, 2012 Commercial - unsecured [Member]	Sep. 30, 2013 Consumer Other Financing Receivable [Member]	Jun. 30, 2012 Consumer Other Financing Receivable [Member]	Sep. 30, 2013 Consumer - direct [Member]	Dec. 31, 2012 Consumer - direct [Member]
Financing Receivable, Modifications [Line Items]
Total accruing TDRs	$ 70,167		$ 85,508		$ 27,820	$ 32,993	$ 22,644	$ 34,672	$ 8,060	$ 5,624	$ 9,841	$ 10,564	$ 1,667	$ 1,518	$ 124	$ 121	$ 11	$ 0	$ 0	$ 16
Non-accrual TDRs	30,501	[1]	31,245	[1]
Total TDRs	$ 100,668		$ 116,753

[1] Included within non-accrual loans in the preceding table detailing non-performing assets.