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Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Statement of Stockholders' Equity [Abstract] |  |  |  |
Cash Dividends Paid, per Share (in dollars per share) | $ 0.26 | $ 0.242 | $ 0.52 | $ 0.485
Exercised (in shares) | 36,577 | 51,339 | 62,712 | 79,001
Shares Issued Under Directors Stock Plan (in shares) | 3,997 | 2,705 | 3,997 | 2,705
Shares Issued Under Employee Stock Purchase Plan (in shares) | 4,239 | 3,939 | 7,948 | 7,613
Shares Issued for Dividend Reinvestment Plans (in shares) | 13,566 | 11,846 | 26,698 | 24,305
Purchase of Treasury Stock (in shares) | 19,708 | 21,294 | 60,560 | 40,009

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