CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balances at Dec. 31, 2019		$ 182,627	$ 53	$ 46,382	$ 153,701	$ (11,710)	$ (5,799)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		14,029			14,029
Other comprehensive (loss) income		7,441					7,441
Restricted stock awards		431		431
Restricted stock units for directors' deferred compensation plan		25		25
Distribution of treasury stock grants for employee restricted stock awards		0		(7)		7
Cash dividends declared		(3,743)			(3,743)
Distribution of treasury stock for directors' compensation		350		144		206
Distribution of shares of treasury stock for employee stock compensation		100		41		59
Distribution of shares of treasury stock for deferred directors' compensation		(12)		(180)		168
Repurchase of common stock		(5,137)				(5,137)
Sale of treasury stock	[1]	894		51		843
Forfeiture of shares of restricted stock awards		0		5		(5)
Ending balances at Sep. 30, 2020		197,005	53	46,892	163,987	(15,569)	1,642
Beginning balances at Jun. 30, 2020		194,589	53	46,758	159,505	(13,869)	2,142
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		5,711			5,711
Other comprehensive (loss) income		(500)					(500)
Restricted stock awards		125		125
Restricted stock units for directors' deferred compensation plan		5		5
Cash dividends declared		(1,229)			(1,229)
Repurchase of common stock		(1,816)				(1,816)
Sale of treasury stock	[1]	120		4		116
Ending balances at Sep. 30, 2020		197,005	53	46,892	163,987	(15,569)	1,642
Beginning balances at Dec. 31, 2020		199,699	53	46,764	168,006	(17,525)	2,401
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		19,971			19,971
Other comprehensive (loss) income		(9,467)					(9,467)
Restricted stock awards		307		307
Restricted stock units for directors' deferred compensation plan		14		14
Cash dividends declared		(4,104)			(4,104)
Distribution of treasury stock for directors' compensation		317		64		253
Distribution of shares of treasury stock for employee stock compensation		132		27		105
Distribution of shares of treasury stock for deferred directors' compensation		3		(72)		75
Repurchase of common stock		(1,050)				(1,050)
Sale of treasury stock	[1]	317		99		218
Ending balances at Sep. 30, 2021		206,139	53	47,203	183,873	(17,924)	(7,066)
Beginning balances at Jun. 30, 2021		203,977	53	47,081	178,673	(17,972)	(3,858)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		6,646			6,646
Other comprehensive (loss) income		(3,208)					(3,208)
Restricted stock awards		84		84
Restricted stock units for directors' deferred compensation plan		5		5
Cash dividends declared		(1,446)			(1,446)
Repurchase of common stock		(4)				(4)
Sale of treasury stock	[1]	85		33		52
Ending balances at Sep. 30, 2021		$ 206,139	$ 53	$ 47,203	$ 183,873	$ (17,924)	$ (7,066)

[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.