Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Certain Loans Acquired Accretable Yield Roll Forward (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Certain Loans Acquired Accretable Yield Roll Forward (Details) - FirstMerit Bank
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]  
Balance, beginning of period $ 0
Impact of acquisition on March 1, 2014 (17,717)
Accretion (5,401)
Reclassification from nonaccretable difference 24,353
Balance, end of period $ 36,669