Quarterly report pursuant to Section 13 or 15(d)

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

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Certain Loans Acquired Ending and Unpaid Balances (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit Impaired, Ending Balance $ 153,695 $ 0
Commercial | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit Impaired, Ending Balance 104,560 0
Commercial | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit Impaired, Ending Balance 49,135 $ 0
FirstMerit Corporation    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit Impaired, Ending Balance 153,695  
Purchased Credit Impaired, Unpaid Balance 212,389  
FirstMerit Corporation | Commercial | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit Impaired, Ending Balance 104,560  
Purchased Credit Impaired, Unpaid Balance 148,243  
FirstMerit Corporation | Commercial | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased Credit Impaired, Ending Balance 49,135  
Purchased Credit Impaired, Unpaid Balance $ 64,146