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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Shares outstanding | 18,926,810 |  |
Common stock options exercised and related tax benefits, shares | 19,860 |  |
Issuance of shares for Employee Stock Purchase Plan, shares | 56,849 | 18,740 | 29,273
Share repurchase, share | (220,222) | (739,778) |
Shares outstanding | 18,974,703 | 18,926,810 |
Common Stock [Member] |  |  |
Shares outstanding | 18,926,810 | 19,337,662 | 18,619,634
Restricted stock units issued, shares | 170,575 | 144,026 | 90,771
Restricted stock forfeitures, shares |  |  | (94,034)
Restricted stock units/awards repurchased on vesting to pay taxes, shares | (43,935) | (40,197) | (45,404)
Cash dividends declared on common stock, per share | $ 0.20 | $ 0.20 | $ 0.20
Common stock options exercised and related tax benefits, shares | 19,860 | 18,660 | 23,148
Common stock options exercised, used to exercise, shares | 2,149 |  | 2,374
Common stock options exercised, net of shares used to exercise, shares | 17,711 |  | 20,774
Sales of shares (Dividend Reinvestment Program), shares |  |  | 542,302
Issuance of shares for Employee Stock Purchase Plan, shares | 56,849 | 18,740 | 29,273
Share repurchase, share | (220,222) | (739,778) |
Issuance of shares for Employee's Savings and Investment plan, shares |  |  | 34,449
Issuance of common stock for acquisition, shares | 60,384 | 184,806 | 139,897
Exercise of warrants, shares | 20,000 | 7,109 |
Exercise of warrants, used to exercise, shares | 13,469 | 4,218 |
Exercise of warrants, net of shares used to exercise, shares | 6,531 | 2,891 |
Shares outstanding | 18,974,703 | 18,926,810 | 19,337,662

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