Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Certain Loans Acquired Balances at Acquisition (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Certain Loans Acquired Balances at Acquisition (Details) - FirstMerit Bank - USD ($)
$ in Thousands
Dec. 31, 2016
Aug. 16, 2016
Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Commercial, Contractually Required Payments Receivable at Acquisition   $ 283,947  
Certain Loans Acquired in Transfer, Nonaccretable Difference   84,315  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Commercial, Cash Flows Expected to be Collected at Acquisition   199,632  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield $ 36,669 17,717 $ 0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value   $ 181,915