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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shares outstanding | 18,619,634 |  |
Cash dividends declared on common stock, per share | $ 0.20 | $ 0.20 | $ 0.20
Common stock options exercised and related tax benefits, shares | 23,148 |  |
Issuance of shares for Employee Stock Purchase Plan, shares | 29,273 | 25,404 | 32,190
Shares outstanding | 19,337,662 | 18,619,634 |
Common Stock [Member] |  |  |
Shares outstanding | 18,619,634 | 17,257,995 | 16,068,119
Restricted stock units issued, shares | 90,771 | 74,936 |
Restricted stock awards forfeitures, shares | (94,034) | (479) | (12,133)
Restricted stock repurchased on vesting to pay taxes, shares | (45,404) | (58,598) | (29,088)
Common stock options exercised and related tax benefits, shares | 23,148 | 50,473 | 70,632
Common stock options exercised, used to exercise, shares | 2,374 | 8,764 | 9,723
Common stock options exercised, net of shares used to exercise, shares | 20,774 | 41,709 | 60,909
Sales of shares (Dividend Reinvestment Program), shares | 542,302 | 1,204,710 | 1,137,998
Issuance of shares for Employee Stock Purchase Plan, shares | 29,273 | 25,404 | 32,190
Issuance of shares for Employee's Savings and Investment plan, shares | 34,449 | 30,123 |
Issuance of common stock for acquisition, shares | 139,897 | 43,834 |
Shares outstanding | 19,337,662 | 18,619,634 | 17,257,995

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