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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY [Abstract] |  |  |  |
Purchase of treasury stock (in shares) | 727 | 12,483 | 15,483 | 40,400
Restricted stock (in shares) | 1,234 | 3,018 | 6,653 | 9,669
Cash dividend reinvestment paid from treasury stock (in shares) |  | 5,128 |  | 15,404
Cash dividends (in dollars per share) | $ 0.470 | $ 0.456 | $ 1.391 | $ 1.445

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