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Equity Plan - Unrecognized Compensation Cost - Nonvested Restricted Stock Awards (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unrecognized Compensation Cost      
Total compensation cost $ 2,248,000 $ 1,924,000 $ 1,817,000
Total income tax expense (benefit) on share-based compensation cost 301,000 $ (146,000) $ (424,000)
Restricted stock      
Unrecognized Compensation Cost      
Total unrecognized compensation cost related to nonvested restricted stock awards $ 2,198,000    
Expected weighted-average period for recognition of compensation costs related to nonvested restricted stock awards 1 year 9 months 3 days