Summary of Significant Accounting Policies - Loans and Allowance for Loan and Lease Losses (Details)	12 Months Ended
	Dec. 31, 2015 Segment component
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for delinquency status of financing receivables	30 days
Threshold period of consecutive payments to remove from nonaccrual status	6 months
Number of components used to develop allowance for loan and lease losses | component	3
Credit Card Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan origination fees and direct loan origination costs amortization period	12 months
Threshold period past due for write-off of financing receivable	180 days
Credit Card Portfolio Segment [Member] | Privileges Revoked
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for write-off of financing receivable	120 days
Credit Card Portfolio Segment [Member] | Notification of Death
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for write-off of financing receivable	60 days
Credit Card Portfolio Segment [Member] | Chapter Seven Bankruptcy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period following bankruptcy notice for write-off of financing receivable	30 days
Credit Card Portfolio Segment [Member] | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for nonperforming status of financing receivables	90 days
Credit Card Portfolio Segment [Member] | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for nonperforming status of financing receivables	120 days
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of portfolio subsegments within portfolio segment | Segment	4
Consumer Portfolio Segment [Member] | Notification of Death
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for write-off of financing receivable	60 days
Consumer Portfolio Segment [Member] | Chapter Seven Bankruptcy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for write-off of financing receivable	40 days
Consumer Portfolio Segment [Member] | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for nonperforming status of financing receivables	90 days
Threshold period past due for write-off of financing receivable	120 days
Consumer Portfolio Segment [Member] | Auto | Chapter Seven Bankruptcy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for write-off of financing receivable	60 days
Consumer Portfolio Segment [Member] | Home loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for nonperforming status of financing receivables	90 days
Threshold period past due for write-off of financing receivable	180 days
Consumer Portfolio Segment [Member] | Home loan | Chapter Seven Bankruptcy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for write-off of financing receivable	60 days
Consumer Portfolio Segment [Member] | Small Business Banking Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for nonperforming status of financing receivables	90 days
Consumer Portfolio Segment [Member] | Small Business Banking Loans | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for write-off of financing receivable	90 days
Consumer Portfolio Segment [Member] | Small Business Banking Loans | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for write-off of financing receivable	120 days
Consumer Portfolio Segment [Member] | Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for write-off of financing receivable	120 days