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PENSION PLAN AND OTHER BENEFIT PLANS - Additional Information (Details) - USD ($)
 12 Months Ended
Jan. 01, 2017
Oct. 20, 2016
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]        
Period of employment multiplier     5 years  
Average total life expectancy of participants (years)     21 years 8 months 12 days  
Percentage (decrease) increase in unrecognized net loss of the projected benefit obligation     0.27  
Hours requirement to be eligible   1000 hours    
All other sources gain (loss) (less than)     $ 1,000  
Defined Contribution Profit Sharing, Savings and Investment Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer non-discretionary contribution amount 3.00%   3.00%  
Contribution cost percentage 50.00%   50.00%  
Defined contribution plan, employer matching contribution, percent of employees' gross pay 6.00%   6.00%  
Total expense     $ 1,600,000 $ 1,400,000
Chemung common stock included in defined contribution plan assets (in shares)     112,006 124,214
Defined Contribution Supplemental Executive Retirement Plan        
Defined Benefit Plan Disclosure [Line Items]        
Total expense     $ 700,000 $ 600,000
Balance in the plan     4,000,000.0 3,400,000
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation     29,200,000 31,000,000.0
Actuarial loss, increase due to change in discount rate     $ 1,500,000  
Percentage of combined loss of expected year end obligations (less than)     0.013  
Other comprehensive income, defined benefit plans, (decrease) increase in net unamortized gain loss arising during period net of tax     $ (2,000,000)  
Other comprehensive income, defined benefit plans, decrease in net unamortized gain loss arising during period net of tax, due to variance of actual and expected return on plan assets     $ 900,000  
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%  
Increase/(decrease) in the discount rate percentage     1.00%  
Increase in net pension cost     $ 142,000  
Decrease in net pension cost     (48,000)  
Decrease in year-end projected benefit obligation     (2,400,000)  
Increase in year-end projected benefit obligation     $ 2,800,000  
Percentage (decrease) increase in unrecognized net loss of the projected benefit obligation     (0.065)  
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) increase in net unamortized gain loss arising during period net of tax     $ 21,000  
Contribution cost percentage     50.00%  
Decrease in accumulated benefit obligation due to change in discount rate     $ 2,000  
Increase in accumulated benefit obligation due to discount rate, claims and date experience     $ 43,000  
Average future working lifetime of active participants     6 years  
Estimated employer contributions in next fiscal year     $ 15,000  
Executive Supplemental Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation     900,000 $ 900,000
Actuarial loss, increase due to change in discount rate     $ 30,000  
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)     9 years 7 months 20 days  
Percentage (decrease) increase in unrecognized net loss of the projected benefit obligation     (0.011)  
All other sources gain (loss) (less than)     $ 0  
Estimated employer contributions in next fiscal year     110,000  
Actuarial gain (loss), increase due to change in mortality losses     30,000  
Defined benefit plan, decrease in total unrecognized net loss     $ 10,000