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RETIREMENT PLANS, ESTIMATED FUTURE BENEFIT PAYMENTS (Details) - Qualified noncontributory defined benefit retirement plan
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Contributions, next fiscal year $ 0
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2018 130,000
2019 130,000
2020 130,000
2021 130,000
2022 130,000
2023-2026 $ 633,000