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Allowance for Credit Losses on Loans - Composition of Nonaccrual Loans by Class (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable Impaired [Line Items]    
Nonaccrual Loans with No Allowance $ 0 $ 581
Nonaccrual Loans with an Allowance 192 520
Total Nonaccrual loans 192 1,101
Interest Income 15 47
Real Estate - Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Nonaccrual Loans with No Allowance 0 400
Nonaccrual Loans with an Allowance 0 88
Total Nonaccrual loans 0 488
Interest Income 0 13
Real Estate - Residential [Member]    
Financing Receivable Impaired [Line Items]    
Nonaccrual Loans with No Allowance 0 181
Nonaccrual Loans with an Allowance 64 97
Total Nonaccrual loans 64 278
Interest Income 13 15
Home Equity [Member]    
Financing Receivable Impaired [Line Items]    
Nonaccrual Loans with an Allowance 40 181
Total Nonaccrual loans 40 181
Interest Income 1 8
Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Nonaccrual Loans with an Allowance 88 154
Total Nonaccrual loans 88 154
Interest Income $ 1 $ 11