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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