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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands		3 Months Ended
	Jun. 15, 2018	Jun. 30, 2018	Sep. 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			$ 14,516		$ 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			26,544		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			1,246		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			202,355		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			$ 15,627		$ 15,022
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 fees		$ 1,000

X

- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Amount awarded to other party in judgment or settlement of litigation.

+ References

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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