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Summary of Significant Accounting Policies - Loans and Allowance for Loan and Lease Losses (Details)
12 Months Ended
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for delinquency status of financing receivables 30 days
Credit Card Portfolio Segment [Member]  
Loans and Leases Receivable Disclosure [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  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for write-off of financing receivable 120 days
Credit Card Portfolio Segment [Member] | Notification of Death  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for write-off of financing receivable 60 days
Credit Card Portfolio Segment [Member] | Chapter Seven Bankruptcy  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for write-off of financing receivable 30 days
Consumer Portfolio Segment [Member]  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 90 days
Consumer Portfolio Segment [Member] | Notification of Death  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 60 days
Consumer Portfolio Segment [Member] | Auto  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 120 days
Consumer Portfolio Segment [Member] | Home loan  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 180 days
Consumer Portfolio Segment [Member] | Small Business Banking Loans | Maximum  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 120 days
Consumer Portfolio Segment [Member] | Other Consumer Loans  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold Period Following Bankruptcy Notice for Write-off of Financing Receivable 40 days
Consumer Portfolio Segment [Member] | Auto and home loan [Member]  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold Period Following Bankruptcy Notice for Write-off of Financing Receivable 60 days
Consumer Portfolio Segment [Member] | Auto and home loan [Member] | Chapter Seven Bankruptcy  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 60 days