CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Balances at Dec. 31, 2015		$ 137,242	$ 53	$ 45,537	$ 118,973	$ (16,379)	$ (10,942)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		7,073			7,073
Other comprehensive income		3,137					3,137
Restricted stock awards		145		145
Restricted stock units for directors' deferred compensation plan		72		72
Cash dividends declared		(3,664)			(3,664)
Distribution of shares of treasury stock for directors' compensation		262		19		243
Distribution of shares of treasury stock for employee stock compensation		210		15		195
Distribution of treasury stock for deferred directors' compensation		3		(92)		95
Sale of treasury stock	[1]	332		28		304
Balances at Sep. 30, 2016		144,812	53	45,724	122,382	(15,542)	(7,805)
Balances at Jun. 30, 2016							(7,535)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		2,745
Other comprehensive income		(270)					(270)
Balances at Sep. 30, 2016		144,812	53	45,724	122,382	(15,542)	(7,805)
Balances at Dec. 31, 2016		143,748	53	45,603	124,111	(15,265)	(10,754)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		9,589			9,589
Other comprehensive income		3,479					3,479
Restricted stock awards		162		162
Restricted stock units for directors' deferred compensation plan		72		72
Cash dividends declared		(3,694)			(3,694)
Distribution of shares of treasury stock for directors' compensation		269		68		201
Distribution of shares of treasury stock for employee stock compensation		200		50		150
Distribution of treasury stock for deferred directors' compensation		11		(51)		62
Sale of treasury stock	[1]	441		142		299
Forfeiture of 1,139 shares of restricted stock awards		0		43		(43)
Balances at Sep. 30, 2017		154,277	53	46,089	130,006	(14,596)	(7,275)
Balances at Jun. 30, 2017							(6,972)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income		3,654
Other comprehensive income		(303)					(303)
Balances at Sep. 30, 2017		$ 154,277	$ 53	$ 46,089	$ 130,006	$ (14,596)	$ (7,275)

[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.