Quarterly report pursuant to Section 13 or 15(d)

BENEFIT PLANS - Fair Value of Plan Assets (Details)

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BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Aug. 16, 2016
Dec. 31, 2015
Summary of plan assets investments      
Fair value of plan assets $ 1,049,326   $ 594,217
Fair value of plan assets, Percentage 100.00%   100.00%
Huntington funds - money market      
Summary of plan assets investments      
Fair value of plan assets $ 161,327   $ 15,590
Fair value of plan assets, Percentage 15.00%   3.00%
Corporate Obligations      
Summary of plan assets investments      
Fair value of plan assets $ 226,857   $ 205,081
Fair value of plan assets, Percentage 22.00%   34.00%
U.S. Government Obligations      
Summary of plan assets investments      
Fair value of plan assets $ 99,956   $ 64,456
Fair value of plan assets, Percentage 9.00%   11.00%
Mutual funds - fixed income      
Summary of plan assets investments      
Fair value of plan assets $ 135,092   $ 32,874
Fair value of plan assets, Percentage 13.00%   6.00%
U.S. Government Agencies      
Summary of plan assets investments      
Fair value of plan assets $ 10,844   $ 6,979
Fair value of plan assets, Percentage 1.00%   1.00%
Mutual Funds - equities      
Summary of plan assets investments      
Fair value of plan assets $ 198,120   $ 136,026
Fair value of plan assets, Percentage 19.00%   23.00%
Common Stock      
Summary of plan assets investments      
Fair value of plan assets $ 181,909   $ 120,046
Fair value of plan assets, Percentage 17.00%   20.00%
Exchange Traded Funds      
Summary of plan assets investments      
Fair value of plan assets $ 18,729   $ 6,530
Fair value of plan assets, Percentage 2.00%   1.00%
Limited Partnerships      
Summary of plan assets investments      
Fair value of plan assets $ 11,297   $ 6,635
Fair value of plan assets, Percentage 1.00%   1.00%
EquitySecuritiesMember - Huntington Preferred Stock      
Summary of plan assets investments      
Fair value of plan assets $ 5,195   $ 0
Fair value of plan assets, Percentage 1.00%   0.00%
FirstMerit Bank      
Summary of plan assets investments      
Fair value of plan assets $ 279,000 $ 280,000