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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Exercise of stock options, shares, including tax benefit |  |  | 34,250
Purchase of treasury stock, shares | 1,298 | 51,052 | 100,000
Reissue of treasury stock, shares | 7,933 | 6,766 | 6,986
Cash dividends declared, per share | $ 0.66 | $ 0.66 | $ 0.66
Additional Paid-In Capital [Member] |  |  |
Restricted stock award grants, shares | 52,750 | 48,300 | 35,400
Exercise of stock options, shares, including tax benefit |  |  | 34,250
Reissue of treasury stock, shares | 7,933 | 6,766 | 6,986
Retained Earnings [Member] |  |  |
Cash dividends declared, per share | $ 0.66 | $ 0.66 | $ 0.66
Treasury Stock [Member] |  |  |
Restricted stock award grants, shares | 52,750 | 48,300 | 35,400
Exercise of stock options, shares, including tax benefit |  |  | 34,250
Purchase of treasury stock, shares | 1,298 | 51,052 | 100,000
Reissue of treasury stock, shares | 7,933 | 6,766 | 6,986

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