Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles - Loans and Leases (Details)

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Summary of Significant Accounting Principles - Loans and Leases (Details) - portfolio_segment
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of portfolio segments 3  
Threshold period past due for nonperforming status of financing receivables 90 days 90 days
Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Probability of default measurement period 12 months  
Home equity lines of credit | Second Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loss severity 100.00%  
Consumer Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Period for sustained repayment performance 6 months  
Consumer Portfolio Segment | Personal Property Secured Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of financing receivable 120 days  
Consumer Portfolio Segment | Personal Property Secured Loans | Chapter Seven Bankruptcy    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of financing receivable 60 days  
Consumer Portfolio Segment | Credit Card and Other Unsecured Consumer Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of financing receivable 180 days  
Consumer Portfolio Segment | Credit Card and Other Unsecured Consumer Loans | Death or Bankruptcy    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of financing receivable 60 days  
Consumer real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of financing receivable 180 days  
Consumer real estate | Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of financing receivable 180 days  
Consumer real estate | Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for nonperforming status of financing receivables 90 days  
Consumer real estate | Core Portfolio, Home Equity Financing Receivable    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for nonperforming status of financing receivables 90 days  
Consumer real estate | Junior Lien Home Equity Financing Receivable    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for nonperforming status of financing receivables 90 days  
Credit card and other consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of financing receivable 180 days  
Credit card and other consumer | Credit Card and Other Unsecured Consumer Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of renegotiated financing receivable placed on a fixed payment plan 120 days  
Commercial Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for nonperforming status of financing receivables 90 days  
Commercial Portfolio Segment | Business Card Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of financing receivable 180 days  
Commercial Portfolio Segment | Business Card Loans | Death or Bankruptcy    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for write-off of financing receivable 60 days