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COMMITMENTS AND CONTINGENCIES - Life Insurance and Control Agreements (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Share Repurchase Plan |  |
Share repurchase program authorized amount | $ 250,000 |
Stock repurchased in open market transactions (in shares) | 8,581 |
Stock repurchased in open market transactions | $ 30,340 |
Authorized balance remaining under share repurchase program | 219,659 |
Maximum |  |
Commitment and contingencies |  |
Professional outplacement services that would be received by the participants | $ 10,000 |
2002 Plan |  |
Commitment and contingencies |  |
Period of graded vesting schedule | 5 years |
Annual vesting by the participants (as a percent) | 20.00% |
Expenses incurred | $ 207,000 | $ 327,000
2002 Plan | Officer participants |  |
Commitment and contingencies |  |
Bonus to be paid as a percentage of the participants base annual salary | 15.00% |
2002 Plan | Other participants |  |
Commitment and contingencies |  |
Bonus to be paid as a percentage of the participants base annual salary | 10.00% |
Agreement(s) | Officer participants |  |
Commitment and contingencies |  |
Period of continued participation in health, disability and life insurance plans after involuntary termination | 3 years |
Agreement(s) | Other participants |  |
Commitment and contingencies |  |
Period of continued participation in health, disability and life insurance plans after involuntary termination | 2 years |

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