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 Thousands
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount $ 102,380
FirstMerit Bank  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 102,380
Acquired loans, unpaid balance 156,351
Commercial and Industrial | Commercial  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 68,338
Commercial and Industrial | Commercial | FirstMerit Bank  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 68,338
Acquired loans, unpaid balance 100,031
Commercial Real Estate | Commercial  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 34,042
Commercial Real Estate | Commercial | FirstMerit Bank  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount 34,042
Acquired loans, unpaid balance 56,320
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
Other Consumer | Consumer  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Acquired loans, carrying amount $ 0