Summary of Significant Accounting Policies Significant Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2011
Increase in Other Expenses to Correct for Immaterial Error in Hedge Accounting	3.9
Days past due for nonaccrual status, certain commercial, credit card and mortgage loans, loans and leases		90 days
Days past due for nonaccrual status, credit card loans		120 days
Minimum percentage for tax benefit that is expected to be realized upon examination		50.00%
Substandard [Member] | Minimum [Member]
Determination Of Specific Allowance For Loan Losses		300
Doubtful [Member] | Minimum [Member]
Determination Of Specific Allowance For Loan Losses		100