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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Purchase of Company's common shares at cost, shares 1,233 12,091
Cash dividends declared, per share $ 0.41 $ 0.32
Common Stock issued under incentive plans, shares 7,905 3,877
Common Stock [Member]    
Purchase of Company's common shares at cost, shares 1,233 12,091
Common Stock issued under incentive plans, shares 7,905 3,877
Additional Paid-in Capital [Member]    
Purchase of Company's common shares at cost, shares 1,233 12,091
Common Stock issued under incentive plans, shares 7,905 3,877
Retained Earnings [Member]    
Purchase of Company's common shares at cost, shares 1,233 12,091
Cash dividends declared, per share $ 0.41 $ 0.32
Common Stock issued under incentive plans, shares 7,905 3,877