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PARENT COMPANY FINANCIAL INFORMATION - STATEMENTS OF INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
STATEMENTS OF INCOME [Abstract]    
Income before income tax expense $ 33,760 $ 23,869
Income tax benefit 7,335 4,607
Net income 26,425 19,262
Parent Company    
STATEMENTS OF INCOME [Abstract]    
Dividends from subsidiary bank and non-bank 6,854 10,806
Interest and dividend income 4 5
Non-interest income 85 (50)
Non-interest expenses 432 503
Income before impact of subsidiaries' undistributed earnings 6,511 10,258
Income before income tax expense 26,299 19,080
Income tax benefit (126) (182)
Net income 26,425 19,262
Parent Company | Chemung Canal Trust Company    
STATEMENTS OF INCOME [Abstract]    
Income (loss) from equity method investments 19,492 8,204
Parent Company | CFS Group Inc.    
STATEMENTS OF INCOME [Abstract]    
Income (loss) from equity method investments 198 8
Parent Company | Chemung Risk Management    
STATEMENTS OF INCOME [Abstract]    
Income (loss) from equity method investments $ 98 $ 610