v3.26.1
Loans and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]    
Accrued interest receivable $ 1,400,000 $ 1,300,000
Bank loans outstanding 421,864,000 419,474,000
Loans past due over 90 days still accruing interest 0 0
Related Party [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Bank loans outstanding 7,100,000 3,600,000
Maximum [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Reduced credit administration process for commercial relationships 500,000  
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans collateralized by real estate $ 0 $ 0