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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Forfeiture of restricted stock award grants shares | 2,482 |  |
Restricted stock award grants, shares | 39,673 |  |
Issuance of common stock, net of issuance costs,shares | 894,896 |  |
Purchase of treasury stock, shares | 75,162 | 1,298 | 51,052
Reissue of treasury stock, shares |  | 7,933 | 6,766
Cash dividends declared, per share | $ 0.66 | $ 0.66 | $ 0.66
Additional Paid-In Capital [Member] |  |  |
Forfeiture of restricted stock award grants shares | 2,482 |  |
Restricted stock award grants, shares | 39,673 | 52,750 | 48,300
Issuance of common stock, net of issuance costs,shares | 834,896 |  |
Purchase of treasury stock, shares | 75,162 |  |
Reissue of treasury stock, shares |  | 7,933 | 6,766
Retained Earnings [Member] |  |  |
Cash dividends declared, per share | $ 0.66 | $ 0.66 | $ 0.66
Treasury Stock [Member] |  |  |
Forfeiture of restricted stock award grants shares | 2,482 |  |
Restricted stock award grants, shares | 39,673 | 52,750 | 48,300
Purchase of treasury stock, shares | 75,162 | 1,298 | 51,052
Reissue of treasury stock, shares |  | 7,933 | 6,766

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