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Income Taxes - Additional Information (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Deferred federal income tax liability	$ 1,179,000	$ 311,000
Federal
Income Taxes [Line Items]
Deferred federal income tax liability	0
Retained Earnings
Income Taxes [Line Items]
Deferred tax liabilities, tax deferred income	$ 3,625,000

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Income taxes.

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