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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 24, 2022 | Jan. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 28, 2022
Class of Stock [Line Items] |  |  |  |  |  |
Dividends paid to shareholders |  |  | $ 9,388 | $ 8,844 | $ 8,512 |
Cash dividends paid (in USD per share) |  |  | $ 1.50 | $ 1.38 | $ 1.26 |
Percentage of common stock authorized for repurchase |  | 5.00% |  |  |  |
Remaining shares available under stock repurchase program (in shares) |  |  | 33,724 |  |  |
Shares repurchased (in shares) |  |  | 279,276 | 327,000 | 347,676 |
Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends declared (in USD per share) | $ 0.41 |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  | 300,000

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