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Stock-based Compensation Plan - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock-based Compensation Plans      
Shares available to grant to employees and directors (in shares) 1,929,578    
Stock Options      
Proceeds from stock option exercises $ 993 $ 2,896 $ 24
Restricted Stock Units      
Stock-based Compensation Plans      
Compensation expense related to stock-based compensation plans 4,489 3,803 3,684
Income tax benefit related to compensation expense $ 1,134 964 934
Unrecognized compensation expense, recognized over weighted-average period 1 year 10 months 24 days    
Restricted Stock Units      
Unrecognized compensation expense $ 4,833    
Fair value of units that vested 4,048 3,536 3,319
Tax benefit of units that vested $ 1,089 1,124 1,126
Average remaining contractual term on non-vested units 10 months 24 days    
Aggregate intrinsic value of non-vested units $ 8,691    
Stock Options      
Stock-based Compensation Plans      
Compensation expense related to stock-based compensation plans 17 5,415 19
Income tax benefit related to compensation expense $ 4 1,372 5
Unrecognized compensation expense, recognized over weighted-average period 4 months 24 days    
Stock Options      
Unrecognized compensation expense $ 6    
Total intrinsic value of options exercised 1,221 4,491 $ 13
Total intrinsic value of options exercised, tax benefit 141 934  
Proceeds from stock option exercises $ 993 $ 2,896  
Average remaining contractual term on outstanding stock options 5 years 7 months 6 days    
Aggregate intrinsic value of outstanding stock options $ 600