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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Stockholders' Equity [Abstract] |  |  |
Forfeiture of restricted stock award grants (in shares) | 361 | 2,482 |
Restricted stock award grants (in shares) | 40,108 | 39,673 | 52,570
Issuance of common stock, net of issuance costs (in shares) |  | 834,896 |
Purchase of treasury stock (in shares) | 97,206 | 75,162 | 1,298
Reissue of treasury stock (in shares) |  |  | 7,933
Cash dividends declared (in dollars per share) | $ 0.67 | $ 0.66 | $ 0.66

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