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Employee Benefit and Deferred Compensation Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Retirement Benefits [Abstract] |  |  |  |
Stock options granted (in shares) |  |  | 0 | 0
Treasury shares reissued (in shares) |  |  | 134,783 |
Total stock-based compensation expense | $ 2,595 | $ 2,405 | $ 7,736 | $ 8,153

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