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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.

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