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, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial $ 27,667,532 $ 20,559,834
Commercial real estate 7,255,907 5,268,651
Automobile 10,791,351 9,480,678
Home equity 10,120,029 8,470,482
Residential mortgage 7,665,275 5,998,400
Other consumer 964,666 563,054
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 27,667,532 20,559,834
Commercial real estate 7,255,907 5,268,651
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 25,922,981 19,257,789
Commercial real estate 6,977,718 5,066,054
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 1,128,765 895,577
Commercial real estate 155,607 121,167
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 591,927 399,339
Commercial real estate 120,371 79,787
Commercial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 23,859 7,129
Commercial real estate 2,211 1,643
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 10,788,093 9,480,678
Home equity 10,116,086 8,470,482
Residential mortgage 7,586,007 5,998,400
RV and marine finance 1,837,565 0
Other consumer 964,086 563,054
Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 5,430,033 4,680,684
Home equity 6,295,798 5,210,741
Residential mortgage 4,609,160 3,564,064
RV and marine finance 1,027,428 0
Other consumer 336,081 233,969
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 3,933,502 3,454,585
Home equity 2,895,693 2,466,425
Residential mortgage 2,219,426 1,813,779
RV and marine finance 633,849 0
Other consumer 430,994 269,746
Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,229,856 1,086,914
Home equity 636,889 582,326
Residential mortgage 625,144 567,984
RV and marine finance 70,189 0
Other consumer 120,132 49,650
Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 194,702 258,495
Home equity 287,706 210,990
Residential mortgage 132,277 52,573
RV and marine finance 106,099 0
Other consumer $ 76,879 $ 9,689