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Consolidated Statements of Changes In Stockholders' Equity Parenthetical - $ / shares | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Statement of Stockholders' Equity [Abstract] |  |
Cash Dividends Paid, per Share, in dollars per share | $ 0.50 | $ 0.485
Exercised, in shares | 79,001 | 33,062
Shares Issued Under Directors Stock Plan, in shares | 2,705 | 3,927
Shares Issued Under Employee Stock Purchase Plan, in shares | 7,613 | 7,300
Shares Issued for Dividend Reinvestment Plans - Shares | 24,305 | 24,999
Purchase of Treasury Stock, in shares | 40,009 | 56,908

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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