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Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 USD ($) Type $ / shares shares | Jun. 30, 2021 USD ($)
Restricted and Performance Stock Grants [Abstract] |  |
Number of types of restricted stock | Type | 2 |
Additional Disclosures [Abstract] |  |
Compensation expense, gross | $ | $ 4,465 | $ 4,381
Restricted Shares [Member] | Minimum [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Expiration of vesting period | 3 years |
Restricted Shares [Member] | Employees [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Estimated forfeitures | 5.00% |
Restricted Shares [Member] | Executives [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Estimated forfeitures | 0.00% |
Restricted Shares [Member] | Directors [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Estimated forfeitures | 0.00% |
Restricted Shares [Member] | Age 60 [Member] | Executives [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Vesting percentage | 25.00% |
Vesting period before reaching age limit | 2 months |
Restricted Shares [Member] | Age 63 [Member] | Executives [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Vesting percentage | 25.00% |
Vesting period before reaching age limit | 2 months |
Restricted Shares [Member] | Age 65 [Member] | Executives [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Vesting percentage | 100.00% |
Vesting period before reaching age limit | 2 months |
Performance-based Shares [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Measuring period for performance-based shares | 3 years |
Performance-based Shares [Member] | Minimum [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Expiration of vesting period | 3 years |
Restricted and Performance-Based Shares [Member] |  |
Restricted and performance-based stock, shares [Roll Forward] |  |
Beginning of period (in shares) | 807,019 |
Granted (in shares) | 8,125 |
Vested (in shares) | (13,300) |
Forfeited (in shares) | (5,500) |
End of period (in shares) | 796,344 |
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward] |  |
Beginning of period (in dollars per share) | $ / shares | $ 34.92 |
Granted (in dollars per share) | $ / shares | 33.81 |
Vested (in dollars per share) | $ / shares | 39.80 |
Forfeited (in dollars per share) | $ / shares | 42.24 |
End of period (in dollars per share) | $ / shares | $ 34.78 |
Additional Disclosures [Abstract] |  |
Compensation expense, gross | $ | $ 3,900 | 4,000
Compensation expense, net of tax | $ | 2,900 | $ 3,000
Unamortized compensation expense | $ | $ 13,300 |
Restricted and Performance-Based Shares [Member] | Employees [Member] |  |
Additional Disclosures [Abstract] |  |
Weighted average period of recognition for unrecognized compensation expense | 4 years 2 months 12 days |
Restricted and Performance-Based Shares [Member] | Directors [Member] |  |
Additional Disclosures [Abstract] |  |
Weighted average period of recognition for unrecognized compensation expense | 9 months 21 days |
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Minimum [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Post vesting holding period for restricted and performance shares issued | 1 year |
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Maximum [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Post vesting holding period for restricted and performance shares issued | 2 years |
2016 Omnibus Incentive Plan [Member] | Restricted and Performance-Based Shares [Member] | Maximum [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Shares authorized for issuance (in shares) | 2,050,000 |

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