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Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of activity regarding active stock option and stock award plans
The following table shows the combined summary of activity regarding active stock option and stock award plans.
Non-Vested Stock Awards Outstanding
Shares Available for GrantNumber of SharesWeighted-Average Grant-Date Fair Value
Balance, January 1, 2019675,059 253,819 $28.59 
Shares authorized - 2019 EIP62,538 — — 
Granted(74,336)74,336 31.44 
Stock awards vested— (100,299)28.35 
Forfeited1,241 (8,865)30.28 
Balance, December 31, 2019664,502 218,991 29.60 
Shares authorized - 2020 EIP60,233 — — 
Granted(147,576)147,576 37.41 
Stock awards vested— (74,203)28.95 
Forfeited49 (870)31.82 
Balance, December 31, 2020577,208 291,494 33.71 
Shares authorized - 2021 EIP62,369   
Granted(79,072)79,072 36.22 
Stock awards vested (92,622)32.53 
Forfeited250 (3,798)32.13 
Balance, December 31, 2021560,755 274,146 $34.86