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Loans - Additional Information (Detail)
12 Months Ended
Dec. 31, 2021
USD ($)
Second
Dec. 31, 2020
USD ($)
Dec. 27, 2020
USD ($)
Aug. 08, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]          
Loans 90 days or more past due and accruing interest $ 0 $ 0      
Additional Loans Receivable 325,992,000 331,598,000      
Additional committed impared loans 0 0      
Loans modified as troubled debt restructurings 0 0      
Overdrawn deposit account reclassified as loan 106,000 141,000      
Loans and leases receivable, net amount 323,789,000 329,073,000      
PPP loans [Member]          
Loans and Leases Receivable Disclosure [Line Items]          
Additional Loans Receivable     $ 284,000,000,000    
Loans and leases receivable, net amount $ 10,500,000        
Financing Receivable, Interest Rate       1.00%  
Financing Receivable, Number Of Contracts | Second 143        
Forgiven Loans in process     $ 150,000,000    
Percentage Of Loss In Gross Receipts     25.00%    
Maximum Loan Borrowed     $ 2,000,000.0    
Loans Forgiven Amount $ 5,100,000        
PPP loans [Member] | Commercial Loan [Member]          
Loans and Leases Receivable Disclosure [Line Items]          
Loans and leases receivable, net amount $ 30,300,000        
Percentage Of Loan Guarantee By Small Business Administration 100.00%        
Financing Receivable, Number Of Contracts 246        
Covid Nineteen [Member] | Payment Deferral [Member]          
Loans and Leases Receivable Disclosure [Line Items]          
Financing recievable threshold past due         30 days
Loans and leases receivable, net amount $ 11,200,000        
Financing receivable deferral amount 383        
Doubtful [Member]          
Loans and Leases Receivable Disclosure [Line Items]          
Additional Loans Receivable 0 0      
Troubled debt restructurings within past twelve months for which there was a default 0 0      
Other Financial Institutions [Member]          
Loans and Leases Receivable Disclosure [Line Items]          
Participation loans transferred $ 32,100,000 $ 29,600,000