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Stock-Based Compensation Plans (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Type
$ / shares
shares
Mar. 31, 2020
USD ($)
Restricted and Performance Stock Grants [Abstract]    
Number of types of restricted stock | Type 2  
Additional Disclosures [Abstract]    
Compensation expense, gross | $ $ 1,796 $ 2,103
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) | shares 839,686  
Granted (in shares) | shares 0  
Vested (in shares) | shares (16,863)  
Forfeited (in shares) | shares (3,825)  
End of period (in shares) | shares 818,998  
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]    
Beginning of period (in dollars per share) | $ / shares $ 34.77  
Granted (in dollars per share) | $ / shares 0  
Vested (in dollars per share) | $ / shares 33.47  
Forfeited (in dollars per share) | $ / shares 40.27  
End of period (in dollars per share) | $ / shares $ 34.77  
Additional Disclosures [Abstract]    
Compensation expense, gross | $ $ 1,800 2,100
Compensation expense, net of tax | $ 1,300 $ 1,600
Unamortized compensation expense | $ $ 13,400  
Restricted and Performance-Based Shares [Member] | Employees [Member]    
Additional Disclosures [Abstract]    
Weighted average period of recognition for unrecognized compensation expense 4 years 3 months 18 days  
Restricted and Performance-Based Shares [Member] | Directors [Member]    
Additional Disclosures [Abstract]    
Weighted average period of recognition for unrecognized compensation expense 29 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