PARENT COMPANY FINANCIAL INFORMATION - STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 26,425	$ 19,262
Adjustments to reconcile net income to net cash provided by operating activities:
Change in other assets	(1,954)	(9,883)
Change in other liabilities	2,764	8,265
Net cash provided by operating activities	35,461	28,659
Cash flow from financing activities:
Cash dividends paid	(5,318)	(5,006)
Purchase of treasury stock	(1,616)	(7,589)
Sale of treasury stock	426	1,018
Net cash (used in) provided by financing activities	125,466	453,823
Cash and cash equivalents, beginning of period	108,538
Cash and cash equivalents, end of period	26,981	108,538
Parent Company
Cash flows from operating activities:
Net income	26,425	19,262
Adjustments to reconcile net income to net cash provided by operating activities:
Change in dividend receivable	(236)	(1,214)
Change in other assets	(97)	(154)
Change in other liabilities	(252)	8
Expense related to employee stock compensation	132	101
Expense related to restricted stock units for directors' deferred compensation plan	19	29
Expense to employee restricted stock awards	535	672
Net cash provided by operating activities	6,738	9,882
Cash flow from financing activities:
Cash dividends paid	(5,318)	(5,006)
Purchase of treasury stock	(1,616)	(7,589)
Sale of treasury stock	426	1,018
Net cash (used in) provided by financing activities	(6,508)	(11,577)
Increase (decrease) in cash and cash equivalents	230	(1,695)
Cash and cash equivalents, beginning of period	2,243	3,938
Cash and cash equivalents, end of period	2,473	2,243
Parent Company | Chemung Canal Trust Company
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings	(19,492)	(8,204)
Parent Company | CFS Group Inc.
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings	(198)	(8)
Parent Company | Chemung Risk Management
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings	$ (98)	$ (610)