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Common Stock - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 29, 2021 | Jan. 04, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share (in dollars per share) |  |  | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 |  |  |
Dividends paid (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.52 | $ 0.48 | $ 0.44
Stock repurchase program, authorized amount |  |  | $ 30,000,000.0 |  |  |  |  |  |  |  | $ 30,000,000.0 |  |
Common stock repurchased (in shares) |  |  |  |  |  |  |  |  |  |  | 0 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share (in dollars per share) |  | $ 0.14 |  |  |  |  |  |  |  |  |  |  |
Dividends paid (in dollars per share) | $ 0.14 |  |  |  |  |  |  |  |  |  |  |  |

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