CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	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, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2017		$ 149,813		$ 149,651	$ 53	$ 53	$ 45,967	$ 45,967	$ 128,453		$ 128,493	$ (14,320)	$ (14,320)	$ (10,340)	$ (202)	$ (10,542)
Beginning balance (Accounting Standards Update 2016-01) at Dec. 31, 2017	[1]		$ (162)							$ 40					$ (202)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		19,626							19,626
Other comprehensive income (loss)		(869)												(869)
Restricted stock awards		405					405
Distribution of treasury stock for directors' deferred compensation plan		218					(722)					940
Distribution of shares of treasury stock granted for employee restricted stock awards, net		0					(370)					370
Restricted stock units for directors' deferred compensation plan		67					67
Cash dividends declared		(4,990)							(4,990)
Distribution of shares of treasury stock for directors' compensation		301					147					154
Distribution of shares of treasury stock for employee compensation		89					44					45
Sale of shares of treasury stock	[1]	643					282					361
Repurchase of common stock		(112)										(112)
Ending balance at Dec. 31, 2018		165,029			53		45,820		143,129			(12,562)		(11,411)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		15,609							15,609
Other comprehensive income (loss)		5,612												5,612
Restricted stock awards		503					503
Distribution of treasury stock for directors' deferred compensation plan		13					(52)					65
Distribution of shares of treasury stock granted for employee restricted stock awards, net		0					(353)					353
Restricted stock units for directors' deferred compensation plan		42					42
Cash dividends declared		(5,037)							(5,037)
Distribution of shares of treasury stock for directors' compensation		356					139					217
Distribution of shares of treasury stock for employee compensation		100					39					61
Sale of shares of treasury stock	[2]	585					244					341
Repurchase of common stock		(185)										(185)
Ending balance at Dec. 31, 2019		182,627			53		46,382		153,701			(11,710)		(5,799)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		19,262							19,262
Other comprehensive income (loss)		8,200												8,200
Restricted stock awards		672					672
Distribution of treasury stock for directors' deferred compensation plan		(14)					(182)					168
Distribution of shares of treasury stock granted for employee restricted stock awards, net		0					(403)					403
Restricted stock units for directors' deferred compensation plan		29					29
Cash dividends declared		(4,957)							(4,957)
Distribution of shares of treasury stock for directors' compensation		350					145					205
Distribution of shares of treasury stock for employee compensation		101					42					59
Sale of shares of treasury stock	[2]	1,018					74					944
Repurchase of common stock		(7,589)										(7,589)
Forfeiture of restricted stock awards		0					5					(5)
Ending balance at Dec. 31, 2020		$ 199,699			$ 53		$ 46,764		$ 168,006			$ (17,525)		$ 2,401

[1] Due to implementation of ASC 2016-01. See "Adoption of New Accounting Standards" discussion in Note 1.

[2] 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.