Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial $ 27,469,344 $ 28,058,712
Commercial real estate 7,206,096 7,300,901
Automobile 11,876,033 10,968,782
Home equity 9,984,728 10,105,774
Residential mortgage 8,616,059 7,724,961
Other consumer 1,063,971 956,419
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 27,469,344 28,058,712
Commercial real estate 7,206,096 7,300,901
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 25,447,805 26,211,885
Commercial real estate 6,934,670 7,042,304
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 1,189,789 1,028,819
Commercial real estate 126,352 159,098
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 803,540 810,287
Commercial real estate 144,122 96,975
Commercial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 28,210 7,721
Commercial real estate 952 2,524
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 11,874,855 10,966,628
Home equity 9,982,455 10,102,501
Residential mortgage 8,521,672 7,650,025
RV and marine finance 2,369,930 1,844,928
Other consumer 1,063,753 955,982
Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 5,939,409 5,369,085
Home equity 6,359,778 6,280,328
Residential mortgage 5,311,993 4,662,777
RV and marine finance 1,385,176 1,064,143
Other consumer 404,047 346,867
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 4,278,062 4,043,611
Home equity 2,985,933 2,891,330
Residential mortgage 2,479,820 2,285,121
RV and marine finance 853,545 644,039
Other consumer 510,804 455,959
Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,371,574 1,298,460
Home equity 621,817 637,560
Residential mortgage 599,055 615,067
RV and marine finance 91,302 72,995
Other consumer 136,346 133,243
Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 285,810 255,472
Home equity 14,927 293,283
Residential mortgage 130,804 87,060
RV and marine finance 39,907 63,751
Other consumer $ 12,556 $ 19,913