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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Forfeiture of restricted stock award grants (in shares) | 2,699 | 361 | 2,482
Restricted stock award grants (in shares) | 40,978 | 40,108 | 39,673
Performance based restricted stock award grants (in shares) | 798 |  |
Issuance of common stock, net of issuance costs (in shares) | 52,568 |  | 834,896
Purchase of treasury stock (in shares) | 40,000 | 90,898 | 70,202
Cash dividends declared (in dollars per share) | $ 0.68 | $ 0.67 | $ 0.66
Restricted Stock |  |  |
Purchase of treasury stock (in shares) | 10,647 | 6,308 | 4,960
Performance Shares |  |  |
Purchase of treasury stock (in shares) | 294 |  |

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