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Equity Plan - Unrecognized Compensation Cost - Nonvested Restricted Stock Awards (Details) - USD ($) | 12 Months Ended
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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 |  |

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