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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 15, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Commitments to make loans | Fixed Rate        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet contractual amounts of financial instruments   $ 17,062   $ 16,019
Commitments to make loans | Variable Rate        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet contractual amounts of financial instruments   32,329   28,591
Unused lines of credit | Fixed Rate        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet contractual amounts of financial instruments   1,473   1,604
Unused lines of credit | Variable Rate        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet contractual amounts of financial instruments   199,478   200,353
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
Standby letters of credit | Variable Rate        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet contractual amounts of financial instruments   14,416   $ 15,022
Fane v. Chemung Canal Trust Company        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Litigation Settlement, Amount Awarded to Other Party $ 3,300      
Legal reserve     $ 2,300  
Legal fees   $ 1,000