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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 15, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Jan. 01, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Legal accruals and settlements |  | $ 0 | $ 0 | $ 0 | $ 989 |  |
Commitments to make loans | Fixed Rate |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Off-balance sheet contractual amounts of financial instruments |  | 17,021 |  | 17,021 |  | $ 9,137 |
Commitments to make loans | Variable Rate |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Off-balance sheet contractual amounts of financial instruments |  | 28,797 |  | 28,797 |  | 18,033 |
Unused lines of credit | Fixed Rate |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Off-balance sheet contractual amounts of financial instruments |  | 1,431 |  | 1,431 |  | 848 |
Unused lines of credit | Variable Rate |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Off-balance sheet contractual amounts of financial instruments |  | 218,517 |  | 218,517 |  | 212,601 |
Standby letters of credit | Fixed Rate |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Off-balance sheet contractual amounts of financial instruments |  | 0 |  | 0 |  | 0 |
Standby letters of credit | Variable Rate |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Off-balance sheet contractual amounts of financial instruments |  | $ 15,583 |  | $ 15,583 |  | 16,161 |
Fane v. Chemung Canal Trust Company |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |
Amount awarded to other party | $ 3,300 |  |  |  |  |  |
Legal reserve |  |  |  |  |  |  | $ 2,300
Legal accruals and settlements |  |  |  |  |  | $ 1,000 |

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