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Stock Incentive Plan - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock plans, term	10 years
Maximum number of shares to be issued in stock incentive plan (in shares)	149,983
Common stock awarded in SI plan (in shares)	0
Unrecognized share-based compensation cost	$ 1,684,000	$ 1,156,000	$ 1,053,000
Stock Unit Awards and Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock awarded in SI plan (in shares)	48,575	25,950	26,700
Annual Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense, period of recognition	4 years
Cumulative Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense, period of recognition	3 years

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Stock incentive plan, term.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Number of shares authorized for issuance under share-based payment arrangement.

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Gross number of share options (or share units) granted during the period.

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