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Fair Value of Assets and Liabilities - Additional information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, assets, level 1 to level 2 transfers, amount $ 0 $ 0  
Fair value, assets, level 2 to level 1 transfers, amount 0 0  
Fair value, liabilities, level 1 to level 2 transfers, amount 0 0  
Fair value, liabilities, level 2 to level 1 transfers, amount 0 0  
Increase (reduced) the valuation allowance of mortgage servicing rights (135,000) $ 421,000  
Fair Value, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities measured at fair value on nonrecurring basis $ 0   $ 0