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Loans - Consumer, Excluding Credit Card Loan Portfolio, Loan Modifications, Nature and Extent of Modifications (Details) - Consumer, excluding credit card - loan
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Financing Receivable, Impaired [Line Items]        
Percentage, sum of items by type, may exceed     100.00%  
Total residential real estate – excluding PCI | Trial Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 912 1,826 2,170 2,585
Total residential real estate – excluding PCI | Permanent Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 1,244 1,954 2,794 4,721
Total residential real estate – excluding PCI | Interest rate reduction        
Financing Receivable, Impaired [Line Items]        
Concession granted 68.00% 48.00% 73.00% 42.00%
Total residential real estate – excluding PCI | Term or payment extension        
Financing Receivable, Impaired [Line Items]        
Concession granted 80.00% 55.00% 74.00% 48.00%
Total residential real estate – excluding PCI | Principal and/or interest deferred        
Financing Receivable, Impaired [Line Items]        
Concession granted 16.00% 35.00% 14.00% 36.00%
Total residential real estate – excluding PCI | Principal forgiveness        
Financing Receivable, Impaired [Line Items]        
Concession granted 4.00% 9.00% 5.00% 7.00%
Total residential real estate – excluding PCI | Other        
Financing Receivable, Impaired [Line Items]        
Concession granted 54.00% 48.00% 57.00% 53.00%
Residential mortgage | Trial Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 501 977 1,238 1,276
Residential mortgage | Permanent Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 428 686 871 1,655
Residential mortgage | Interest rate reduction        
Financing Receivable, Impaired [Line Items]        
Concession granted 60.00% 37.00% 60.00% 27.00%
Residential mortgage | Term or payment extension        
Financing Receivable, Impaired [Line Items]        
Concession granted 92.00% 46.00% 90.00% 35.00%
Residential mortgage | Principal and/or interest deferred        
Financing Receivable, Impaired [Line Items]        
Concession granted 29.00% 50.00% 28.00% 54.00%
Residential mortgage | Principal forgiveness        
Financing Receivable, Impaired [Line Items]        
Concession granted 6.00% 8.00% 6.00% 7.00%
Residential mortgage | Other        
Financing Receivable, Impaired [Line Items]        
Concession granted 45.00% 32.00% 40.00% 42.00%
Home equity | Trial Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 411 849 932 1,309
Home equity | Permanent Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 816 1,268 1,923 3,066
Home equity | Interest rate reduction        
Financing Receivable, Impaired [Line Items]        
Concession granted 73.00% 53.00% 79.00% 51.00%
Home equity | Term or payment extension        
Financing Receivable, Impaired [Line Items]        
Concession granted 74.00% 59.00% 66.00% 54.00%
Home equity | Principal and/or interest deferred        
Financing Receivable, Impaired [Line Items]        
Concession granted 9.00% 27.00% 8.00% 26.00%
Home equity | Principal forgiveness        
Financing Receivable, Impaired [Line Items]        
Concession granted 4.00% 10.00% 5.00% 7.00%
Home equity | Other        
Financing Receivable, Impaired [Line Items]        
Concession granted 58.00% 57.00% 65.00% 58.00%