PARENT COMPANY FINANCIAL INFORMATION - STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 28,783	$ 26,425
Adjustments to reconcile net income to net cash provided by operating activities:
Change in other assets	(27,636)	(7,386)
Change in other liabilities	25,094	8,322
Expense related to restricted stock units directors' deferred compensation plan	1,200	500
Net cash provided by operating activities	35,047	35,461
Cash flow from financing activities:
Cash dividends paid	(5,797)	(5,318)
Purchase of treasury stock	(933)	(1,616)
Sale of treasury stock	424	426
Net cash (used in) provided by financing activities	246,461	125,466
Increase (decrease) in cash and cash equivalents	28,888	(81,557)
Cash and cash equivalents, beginning of period	26,981
Cash and cash equivalents, end of period	55,869	26,981
Parent Company
Cash flows from operating activities:
Net income	28,783	26,425
Adjustments to reconcile net income to net cash provided by operating activities:
Change in dividend receivable	(5)	(236)
Change in other assets	(211)	(97)
Change in other liabilities	(733)	(252)
Expense related to employee stock compensation	0	132
Expense related to restricted stock units directors' deferred compensation plan	20	19
Expense to employee restricted stock awards	795	535
Net cash provided by operating activities	6,541	6,738
Cash flow from financing activities:
Cash dividends paid	(5,797)	(5,318)
Purchase of treasury stock	(933)	(1,616)
Sale of treasury stock	424	426
Net cash (used in) provided by financing activities	(6,306)	(6,508)
Increase (decrease) in cash and cash equivalents	235	230
Cash and cash equivalents, beginning of period	2,473	2,243
Cash and cash equivalents, end of period	2,708	2,473
Parent Company | Chemung Canal Trust Company
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings	(21,638)	(19,492)
Parent Company | CFS Group Inc.
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings	(220)	(198)
Parent Company | Chemung Risk Management
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings	$ (250)	$ (98)