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
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial $ 28,175,924 $ 28,058,712
Commercial real estate 7,093,118 7,300,901
Automobile 11,155,094 10,968,782
Home equity 9,974,294 10,105,774
Residential mortgage 7,829,137 7,724,961
Other consumer 935,719 956,419
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 28,175,924 28,058,712
Commercial real estate 7,093,118 7,300,901
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 26,216,400 26,211,885
Commercial real estate 6,867,440 7,042,304
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 1,131,835 1,028,819
Commercial real estate 103,983 159,098
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 808,467 810,287
Commercial real estate 120,212 96,975
Commercial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 19,222 7,721
Commercial real estate 1,483 2,524
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 11,153,301 10,966,628
Home equity 9,971,307 10,102,501
Residential mortgage 7,737,393 7,650,025
RV and marine finance 1,933,566 1,844,928
Other consumer 935,318 955,982
Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 5,445,124 5,369,085
Home equity 6,131,710 6,280,328
Residential mortgage 4,643,664 4,662,777
RV and marine finance 1,179,561 1,064,143
Other consumer 333,683 346,867
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 4,254,397 4,043,611
Home equity 2,924,593 2,891,330
Residential mortgage 2,406,782 2,285,121
RV and marine finance 699,701 644,039
Other consumer 440,599 455,959
Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,172,859 1,298,460
Home equity 631,268 637,560
Residential mortgage 611,675 615,067
RV and marine finance 16,202 72,995
Other consumer 142,515 133,243
Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 280,921 255,472
Home equity 283,736 293,283
Residential mortgage 75,272 87,060
RV and marine finance 38,102 63,751
Other consumer $ 18,521 $ 19,913