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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Nov. 30, 2021
Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]      
Period for federal funds sold outstanding 1 day    
Loan non-accrual classification period 90 days    
Days to charged consumer loans to the value of the collateral 90 days    
Maximum time for re-evaluation (in months) 12 months    
Re-evaluation period for real estate 2 years    
Amount of fair value of capital over carrying value   $ 48,800,000  
Percentage of fair value of capital over carrying value   14.50%  
Number of times fair value of capital in excess of carrying value of goodwill description over 60%    
Other real estate owned $ 159,000   $ 71,000
Percentage of likelihood of realization of recognized tax benefit, minimum 50.00%    
Amount of reclassification effect $ 0    
Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Maturity period of cash equivalents 3 months