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Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Employee stock purchase plan (in shares) | 1,410 | 1,388 | 1,481
Dividend reinvestment plan (in shares) | 27,306 | 25,941 | 27,562
Stock option exercises (in shares) |  | 1,355 | 2,000
Stock grants to directors for retainer fees (in shares) | 11,529 | 11,166 | 10,489
Share repurchase program (in shares) |  |  | 683,191
Cash dividends per common share (in dollars per share) | $ 1.34 | $ 1.26 | $ 1.18

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