PARENT COMPANY FINANCIAL INFORMATION - BALANCE SHEETS (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets:
Cash on deposit with subsidiary bank	$ 29,309	$ 17,365
Securities available for sale, at estimated fair value	632,589	792,026
Total assets	2,645,553	2,418,475
Liabilities and shareholders' equity:
Dividends payable	1,455	1,450
Total liabilities	2,479,165	2,207,020
Shareholders' equity:
Total shareholders' equity	166,388	211,455	$ 199,699
Total liabilities and shareholders' equity	2,645,553	2,418,475
Parent Company
Assets:
Cash on deposit with subsidiary bank	2,708	2,473
Dividends receivable from subsidiary bank	1,455	1,450
Securities available for sale, at estimated fair value	329	391
Other assets	1,728	1,517
Total assets	167,894	212,939
Liabilities and shareholders' equity:
Dividends payable	1,455	1,450
Other liabilities	51	34
Total liabilities	1,506	1,484
Shareholders' equity:
Total shareholders' equity	166,388	211,455
Total liabilities and shareholders' equity	167,894	212,939
Parent Company | Chemung Canal Trust Company
Assets:
Investment in subsidiary	157,493	203,373
Parent Company | CFS Group Inc.
Assets:
Investment in subsidiary	1,294	1,074
Parent Company | Chemung Risk Management
Assets:
Investment in subsidiary	$ 2,887	$ 2,661