CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Cumulative effect adjustment for the adoption of ASC 326	[2]	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative effect adjustment for the adoption of ASC 326	[2]	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2021		$ 211,455				$ 53		$ 46,901		$ 188,877				$ (17,846)		$ (6,530)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		21,344								21,344
Other comprehensive loss		(73,351)														(73,351)
Restricted stock awards		486						486
Restricted stock units for directors' deferred compensation plan		195						195
Distribution of shares of treasury stock grants for employee restricted stock awards		0						(112)						112
Cash dividends declared		(4,347)								(4,347)
Distribution of treasury stock for directors' compensation		105						(139)						244
Repurchase of shares of common stock		(695)												(695)
Sale of shares of treasury stock	[1]	328						124						204
Forfeitures of shares of restricted stock awards		(2)						32						(34)
Ending balance at Sep. 30, 2022		155,518				53		47,487		205,874				(18,015)		(79,881)
Beginning balance at Dec. 31, 2021		211,455				53		46,901		188,877				(17,846)		(6,530)
Ending balance at Dec. 31, 2022		$ 166,388	$ (1,076)		$ 165,312	53	$ 53	47,331	$ 47,331	211,859	$ (1,076)		$ 210,783	(17,598)	$ (17,598)	(75,257)	$ (75,257)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]		Accounting Standards Update 2016-13 [Member]
Beginning balance at Jun. 30, 2022		$ 174,690				53		47,196		200,870				(18,084)		(55,345)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		6,453								6,453
Other comprehensive loss		(24,536)														(24,536)
Restricted stock awards		153						153
Restricted stock units for directors' deferred compensation plan		95						95
Cash dividends declared		(1,449)								(1,449)
Sale of shares of treasury stock	[1]	112						41						71
Forfeitures of shares of restricted stock awards								2						(2)
Ending balance at Sep. 30, 2022		155,518				53		47,487		205,874				(18,015)		(79,881)
Beginning balance at Dec. 31, 2022		166,388	$ (1,076)		$ 165,312	53	$ 53	47,331	$ 47,331	211,859	$ (1,076)		$ 210,783	(17,598)	$ (17,598)	(75,257)	$ (75,257)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		21,198								21,198
Other comprehensive loss		(13,422)														(13,422)
Restricted stock awards		837						837
Restricted stock units for directors' deferred compensation plan		15						15
Distribution of shares of treasury stock grants for employee restricted stock awards		0						(217)						217
Cash dividends declared		(4,385)								(4,385)
Distribution of treasury stock for directors' compensation		96						(147)						243
Repurchase of shares of common stock		(98)												(98)
Sale of shares of treasury stock	[1]	512						144						368
Forfeitures of shares of restricted stock awards		(1)						11						(12)
Ending balance at Sep. 30, 2023		170,064				53		47,974		227,596				(16,880)		(88,679)
Beginning balance at Jun. 30, 2023		177,426				53		47,740		221,412				(17,033)		(74,746)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		7,648								7,648
Other comprehensive loss		(13,933)														(13,933)
Restricted stock awards		289						289
Restricted stock units for directors' deferred compensation plan		5						5
Distribution of shares of treasury stock grants for employee restricted stock awards		0						(86)						86
Cash dividends declared		(1,464)								(1,464)
Sale of shares of treasury stock	[1]	93						26						67
Ending balance at Sep. 30, 2023		$ 170,064				$ 53		$ 47,974		$ 227,596				$ (16,880)		$ (88,679)

[1] All treasury stock sales were completed at the prevailing market price with the Chemung Canal Trust Company Profit Sharing, Savings, and Investment Plan which is a defined contribution plan sponsored by the Bank.

[2] Due to implementation of ASC 326. See "Adoption of New Accounting Standards" discussion in Note 1.