Loans and Leases (Loans and Leases Not Covered by Share Agreements (Percentage)) (Details)	Dec. 31, 2012	Dec. 31, 2011
Nonpass
Financing Receivable, Recorded Investment [Line Items]
Percent of nonaccrual loans	15.00%	20.00%
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Percent of loans	50.00%	43.00%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Percent of loans	50.00%	57.00%