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Loans - Summary of Information on Non-accrual Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Non Performing Loans [Line Items]    
Total nonaccrual loans $ 1,110 $ 769
Total nonaccrual loans to total loans 0.28% 0.21%
Total nonaccrual loans to total assets 0.20% 0.14%
Commercial Real Estate [Member]    
Non Performing Loans [Line Items]    
Total nonaccrual loans $ 422  
Residential Real Estate First Mortgages [Member]    
Non Performing Loans [Line Items]    
Total nonaccrual loans 657 $ 714
Consumer Home Equity and Lines of Credit [Member]    
Non Performing Loans [Line Items]    
Total nonaccrual loans $ 31 $ 55