Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Fair Value of Plan Assets (Details)

v3.6.0.2
BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Aug. 16, 2016
Dec. 31, 2015
Summary of plan assets investments      
Fair value of plan assets $ 745,725   $ 594,217
Fair value of plan assets, Percentage 100.00%   100.00%
Federated-money market      
Summary of plan assets investments      
Fair value of plan assets $ 16,087   $ 15,590
Fair value of plan assets, Percentage 2.00%   3.00%
Corporate obligations      
Summary of plan assets investments      
Fair value of plan assets $ 212,967   $ 205,081
Fair value of plan assets, Percentage 28.00%   34.00%
U.S. Government Obligations      
Summary of plan assets investments      
Fair value of plan assets $ 157,764   $ 64,456
Fair value of plan assets, Percentage 21.00%   11.00%
Mutual funds-fixed income      
Summary of plan assets investments      
Fair value of plan assets $ 27,851   $ 32,874
Fair value of plan assets, Percentage 4.00%   6.00%
U.S. Government Agencies      
Summary of plan assets investments      
Fair value of plan assets $ 7,201   $ 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 $ 134,832   $ 136,026
Fair value of plan assets, Percentage 18.00%   23.00%
Common stock      
Summary of plan assets investments      
Fair value of plan assets $ 144,754   $ 120,046
Fair value of plan assets, Percentage 19.00%   20.00%
Preferred stock      
Summary of plan assets investments      
Fair value of plan assets $ 4,778   $ 0
Fair value of plan assets, Percentage 1.00%   0.00%
Exchange Traded Funds      
Summary of plan assets investments      
Fair value of plan assets $ 28,101   $ 6,530
Fair value of plan assets, Percentage 4.00%   1.00%
Limited Partnerships      
Summary of plan assets investments      
Fair value of plan assets $ 11,390   $ 6,635
Fair value of plan assets, Percentage 2.00%   1.00%
FirstMerit Bank      
Summary of plan assets investments      
Fair value of plan assets   $ 280,000