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
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial $ 27,969,151 $ 28,058,712
Commercial real estate 7,145,151 7,300,901
Automobile 11,555,137 10,968,782
Home equity 9,965,534 10,105,774
Residential mortgage 8,237,297 7,724,961
Other consumer 1,009,308 956,419
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 27,969,151 28,058,712
Commercial real estate 7,145,151 7,300,901
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 26,006,917 26,211,885
Commercial real estate 6,923,159 7,042,304
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 1,138,508 1,028,819
Commercial real estate 132,017 159,098
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 798,643 810,287
Commercial real estate 88,932 96,975
Commercial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 25,083 7,721
Commercial real estate 1,043 2,524
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 11,553,726 10,966,628
Home equity 9,963,057 10,102,501
Residential mortgage 8,138,875 7,650,025
RV and marine finance 2,176,527 1,844,928
Other consumer 1,009,082 955,982
Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 5,728,416 5,369,085
Home equity 6,296,801 6,280,328
Residential mortgage 4,945,403 4,662,777
RV and marine finance 1,287,480 1,064,143
Other consumer 386,659 346,867
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 4,202,063 4,043,611
Home equity 3,013,152 2,891,330
Residential mortgage 2,449,297 2,285,121
RV and marine finance 774,873 644,039
Other consumer 481,324 455,959
Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,350,925 1,298,460
Home equity 619,661 637,560
Residential mortgage 610,720 615,067
RV and marine finance 85,844 72,995
Other consumer 135,161 133,243
Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 272,322 255,472
Home equity 33,443 293,283
Residential mortgage 133,455 87,060
RV and marine finance 28,330 63,751
Other consumer $ 5,938 $ 19,913