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PARENT COMPANY FINANCIAL INFORMATION - STATEMENTS OF INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
STATEMENTS OF INCOME [Abstract]    
Income before income tax expense $ 30,085 $ 31,501
Income tax benefit 6,414 6,501
Net income 23,671 25,000
Parent Company    
STATEMENTS OF INCOME [Abstract]    
Dividends from subsidiary bank and non-bank 1,475 7,204
Interest and dividend income 35 11
Non-interest income (24) (125)
Non-interest expenses 296 345
Income before impact of subsidiaries' undistributed earnings 1,190 6,745
Income before income tax expense 23,566 24,835
Income tax benefit (105) (165)
Net income 23,671 25,000
Parent Company | Chemung Canal Trust Company    
STATEMENTS OF INCOME [Abstract]    
Income (loss) from equity method investments 22,344 18,267
Parent Company | CFS Group Inc.    
STATEMENTS OF INCOME [Abstract]    
Income (loss) from equity method investments 32 124
Parent Company | Chemung Risk Management    
STATEMENTS OF INCOME [Abstract]    
Distributed earnings of Chemung Risk Management, Inc. $ 0 $ (301)