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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

X

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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