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Stock-Based Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Additional Disclosures [Abstract] |  |
Compensation expense, gross | $ 3,848 | $ 3,896
Performance-based Shares [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Measuring period for performance-based shares | 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] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Vesting percentage | 25.00% |
Restricted Shares [Member] | Age 63 [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Vesting percentage | 25.00% |
Restricted Shares [Member] | Age 65 [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Vesting percentage | 100.00% |
Restricted and Performance-Based Shares [Member] |  |
Restricted and performance-based stock, shares [Roll Forward] |  |
Beginning of period (in shares) | 870,041 |
Granted (in shares) | 8,000 |
Vested (in shares) | (36,889) |
Forfeited (in shares) | (8,975) |
End of period (in shares) | 832,177 |
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward] |  |
Beginning of period (in dollars per share) | $ 34.59 |
Granted (in dollars per share) | 40.11 |
Vested (in dollars per share) | 32.72 |
Forfeited (in dollars per share) | 44.27 |
End of period (in dollars per share) | $ 34.62 |
Additional Disclosures [Abstract] |  |
Compensation expense, gross | $ 3,400 | 3,300
Compensation expense, net of tax | 2,500 | $ 2,500
Unamortized compensation expense | $ 12,200 |
Restricted and Performance-Based Shares [Member] | Employees [Member] |  |
Additional Disclosures [Abstract] |  |
Weighted average period of recognition for unrecognized compensation expense | 4 years 1 month 6 days |
Restricted and Performance-Based Shares [Member] | Directors [Member] |  |
Additional Disclosures [Abstract] |  |
Weighted average period of recognition for unrecognized compensation expense | 9 months 18 days |
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] |  |
Restricted and Performance Stock Grants [Abstract] |  |
Expiration of vesting period | 3 years |
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 |

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