Loans and Allowance for Credit Losses Loans Modified Under Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 67,012		$ 68,111
Non-accrual TDRs	27,724	[1]	30,209	[1]
Total TDRs	94,736		98,320
Real-estate - residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	30,850		28,815
Real-estate commercial mortage [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	18,869		19,758
Construction - Commercial Residential [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	9,251		10,117
Commercial - Secured [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,042		7,933
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,904		1,365
Commercial - unsecured [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	73		112
Consumer - direct [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	18		11
Consumer Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 5		$ 0

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