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Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]        
Securities transactions income tax (benefit) expense $ 220,000 $ (82,000) $ 171,000  
Federal tax rate, percentage 21.00% 21.00% 21.00%  
Recognition of interest and penalties related to unrecognized tax benefits $ 0 $ 0 $ 0  
Amended Open tax 2023      
Earliest Tax Year [Member]        
Income Taxes [Line Items]        
Year under examination 2018     2018
Latest Tax Year [Member]        
Income Taxes [Line Items]        
Year under examination 2020