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Summary of Significant Accounting Policies - Loans and Allowance for Credit Losses (Details)
 6 Months Ended
Jun. 30, 2020
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for delinquency status of financing receivables 30 days
Credit Card  
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 trade accounts receivable 180 days
Credit Card | Privileges Revoked  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for write-off of trade accounts receivable 120 days
Credit Card | Notification of Death  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for write-off of trade accounts receivable 5 days
Credit Card | Chapter Seven Bankruptcy  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for write-off of trade accounts receivable 30 days
Consumer Banking  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 90 days
Consumer Banking | Notification of Death  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 60 days
Consumer Banking | Chapter Seven Bankruptcy  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 60 days
Consumer Banking | Auto  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period past due for nonperforming status of financing receivables 120 days
Consumer Banking | 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 Banking | Other Consumer Loans  
Loans and Leases Receivable Disclosure [Line Items]  
Threshold period following bankruptcy notice for write-off of financing receivable 40 days