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Loans - Summary of Major Classifications of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]            
Loans, gross [1] $ 385,465   $ 361,947      
Net deferred loan costs 831   830      
Allowance for credit losses for loans (3,614) $ (3,643) (3,203) $ (3,180) $ (3,132) $ (2,858)
Total loans, net of deferred loan costs and allowance for credit losses 382,682   359,574      
Commercial [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Loans, gross     0      
Commercial [Member] | Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Loans, gross 221,653   210,858      
Commercial [Member] | Land [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Loans, gross 0   0      
Commercial [Member] | Other Commercial Loan [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Loans, gross 45,682   43,708      
Residential Real Estate [Member] | First Mortgage [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Loans, gross 95,361   85,444      
Residential Real Estate [Member] | Construction Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Loans, gross 2,707   3,248      
Consumer [Member] | Other Consumer Loan [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Loans, gross 165   99      
Consumer [Member] | Home Equity Lines Of Credit [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Loans, gross $ 19,897   $ 18,590      
[1] Totals do not include accrued interest receivable, which was $987,000 and $874,000 at September 30, 2023 and December 31, 2022, respectively, which is recorded separately on the Company’s Consolidated Balance Sheets.