Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Certain Loans Acquired Ending and Unpaid Balances (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Certain Loans Acquired Ending and Unpaid Balances (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount $ 41
Commercial and Industrial | Commercial Portfolio Segment [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 39
Commercial Real Estate | Commercial Portfolio Segment [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 2
Automobile | Consumer  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 0
Home Equity | Consumer  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 0
Residential Mortgage | Consumer  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 0
RV and marine finance | Consumer  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 0
Consumer | Consumer  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount $ 0