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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) [Abstract] |  |  |  |
Purchase of treasury stock (in shares) |  | 3,382 | 20,620 | 8,711
Cash dividends (in dollars per share) | $ 0.450 | $ 0.436 | $ 1.331 | $ 1.289

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