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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Stockholders' Equity |  |  |
Dividends declared (in dollars per share) | $ 1.44 | $ 1.37 | $ 1.31
Common stock grants awarded, net of unearned compensation | $ 520 | $ 147 | $ 92
Common stock grants awarded, net of unearned compensation (in shares) | 8,506 | 3,854 | 2,548
Share retired, shares | 181,417 | 14,428 |

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