Loans and Leases (Loans and leases not covered by share agreements (percentage)) (Details)	Mar. 31, 2013	Dec. 31, 2012
Nonpass
Financing Receivable, Recorded Investment [Line Items]
Percent of nonaccrual loans	12.00%	15.00%
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Percent of loans	52.00%	50.00%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Percent of loans	48.00%	50.00%