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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement of Stockholders' Equity |  |  |
Dividends declared (in dollars per share) | $ 1.50 | $ 1.44 | $ 1.37
Share retired, shares | 54,285 | 181,417 | 14,428
Common stock grants awarded, net of unearned compensation (in shares) | 9,192 | 8,506 | 3,854
Unearned income | $ 182 | $ 520 | $ 147

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