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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Statement Of Stockholders Equity [Abstract] |  |  |  |
Cash dividends declared per common share | $ 0.40 | $ 0.36 | $ 0.40 | $ 0.36
Issuance of common shares pursuant to the Dividend Reinvestment Plan (in shares) | 13,804 | 13,475 | 13,804 | 13,475
Stock issued during period, shares, deferred compensation | 8,163 | 7,398 | 8,163 | 7,398
Restricted stock issued during period, shares, pursuant to the 2017 stock incentive plan |  |  | 25,200 | 25,950
Stock issued during period, shares, employee stock purchase plans | 3,739 | 2,858 | 7,543 | 2,858

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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