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PENSION PLAN AND OTHER BENEFIT PLANS - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2022
Jan. 01, 2021
Oct. 20, 2016
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]          
Hours requirement to be eligible     1000 hours    
Percentage decrease in unrecognized net loss of the projected benefit obligation       0.31  
Defined Contribution Profit Sharing, Savings and Investment Plan          
Defined Benefit Plan Disclosure [Line Items]          
Defined contribution plan, employer non-discretionary contribution amount       3.00%  
Contribution cost percentage       50.00%  
Defined contribution plan, employer matching contribution, percent of employees' gross pay       6.00%  
Total expense       $ 1,300 $ 1,300
Chemung common stock included in defined contribution plan assets (in shares)       118,081 137,698
Defined Contribution Supplemental Executive Retirement Plan          
Defined Benefit Plan Disclosure [Line Items]          
Total expense       $ 400 $ 400
Balance in the plan       2,400 2,000
Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation       40,400 42,800
Actuarial gain (loss), increase (decrease) due to change in discount rate       $ (1,300)  
Percentage of combined loss of expected year end obligations (less than)       0.01  
Other comprehensive income, defined benefit plans, decrease in net unamortized gain loss arising during period net of tax       $ 3,800  
Other comprehensive income, defined benefit plans, increase (decrease) in net unamortized gain loss arising during period net of tax, due to variance of actual and expected return on plan assets       $ 2,300  
Total unrecognized net loss increased percentage of obligation amortization threshold       10.00%  
Total unrecognized net loss increased (decreased) percentage of plan assets threshold       10.00%  
Average total life expectancy of participants (years)   23 years 25 days      
Pension Plan | Minimum          
Defined Benefit Plan Disclosure [Line Items]          
Evaluation period of expected long-term return on plan assets       3 years  
Pension Plan | Maximum          
Defined Benefit Plan Disclosure [Line Items]          
Evaluation period of expected long-term return on plan assets       5 years  
Other Postretirement Benefit Plan          
Defined Benefit Plan Disclosure [Line Items]          
Other comprehensive income, defined benefit plans, decrease in net unamortized gain loss arising during period net of tax       $ 79  
Contribution cost percentage       50.00%  
Decrease in accumulated benefit obligation due to change in discount rate       $ 4  
Decrease in accumulated benefit obligation due to discount Rate, claims and date experience       31  
Average future working lifetime of active participants   6 years      
Estimated employer contributions in next fiscal year       (33)  
Executive Supplemental Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation       1,200 $ 1,300
Actuarial gain (loss), increase (decrease) due to change in discount rate       $ 24  
Percentage of combined loss of expected year end obligations (less than)       0.01  
Total unrecognized net loss increased percentage of obligation amortization threshold       10.00%  
Total unrecognized net loss increased (decreased) percentage of plan assets threshold       10.00%  
Percentage decrease in unrecognized net loss of the projected benefit obligation       0.016  
Estimated employer contributions in next fiscal year       $ (110)  
Actuarial gain (loss), decrease due to change in mortality losses       26  
Defined benefit plan, decrease in total unrecognized net loss       $ 20  
Executive Supplemental Pension Plan | Subsequent Event          
Defined Benefit Plan Disclosure [Line Items]          
Average total life expectancy of participants (years) 11 years 4 months 20 days