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Condensed Consolidated Statements of Changes in Stockholders' Equity Condensed 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 Changes in Stockholders' Equity [Abstract] |  |  |  |
Dividends on common stock (in dollars per share) | $ 0.36 | $ 0.34 | $ 0.36 | $ 0.34
Stock Issued During Period, Shares, Dividend Reinvestment Plan | 13,475 | 14,626 | 13,475 | 14,626
Deferred Compensation Arrangement with Individual, Shares Issued | 7,398 | 5,342 | 7,398 | 5,342
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 0 | 0 | 25,950 | 13,250
Stock Issued During Period, Shares, New Issues | 0 | 947,368 | 0 | 947,368
Stock Issued During Period, Shares, Acquisitions | 0 | 1,643,900 | 0 | 1,643,900
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 0 | 0 | 2,858 | 782
Treasury Stock, Shares, Acquired | 0 | 2,588 | 0 | 2,588
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | 0 | 2,500 | 0 | 2,500

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 of stock issued during the period pursuant to acquisitions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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