CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Cumulative effect adjustment for the adoption of ASC 326	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	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		14,891							14,891
Other comprehensive loss		(48,815)												(48,815)
Restricted stock awards		333					333
Restricted stock units for directors' deferred compensation plan		100					100
Distribution of shares of treasury stock grants for employee restricted stock awards		0					(112)					112
Cash dividends declared		(2,898)							(2,898)
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]	216					83					133
Forfeitures of shares of restricted stock awards		(2)					30					(32)
Ending balance at Jun. 30, 2022		174,690			53		47,196		200,870			(18,084)		(55,345)
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 Mar. 31, 2022		$ 185,510			53		46,880		194,295			(18,113)		(37,605)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		8,024							8,024
Other comprehensive loss		(17,740)												(17,740)
Restricted stock awards		154					154
Restricted stock units for directors' deferred compensation plan		95					95
Cash dividends declared		(1,449)							(1,449)
Sale of shares of treasury stock	[1]	98					37					61
Forfeitures of shares of restricted stock awards		(2)					30					(32)
Ending balance at Jun. 30, 2022		174,690			53		47,196		200,870			(18,084)		(55,345)
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		13,550							13,550
Other comprehensive loss		511												511
Restricted stock awards		548					548
Restricted stock units for directors' deferred compensation plan		10					10
Distribution of shares of treasury stock grants for employee restricted stock awards		0					(131)					131
Cash dividends declared		(2,921)							(2,921)
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]	419					118					301
Forfeitures of shares of restricted stock awards		(1)					11					(12)
Ending balance at Jun. 30, 2023		177,426			53		47,740		221,412			(17,033)		(74,746)
Beginning balance at Mar. 31, 2023		177,342			53		47,387		216,594	$ (1,100)		(17,219)		(69,473)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		6,280							6,280
Other comprehensive loss		(5,273)												(5,273)
Restricted stock awards		285					285
Restricted stock units for directors' deferred compensation plan		5					5
Cash dividends declared		(1,462)							(1,462)
Sale of shares of treasury stock	[1]	250					52					198
Forfeitures of shares of restricted stock awards		(1)					11					(12)
Ending balance at Jun. 30, 2023		$ 177,426			$ 53		$ 47,740		$ 221,412			$ (17,033)		$ (74,746)

[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.