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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