v3.26.1
Loans - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans serviced for others $ 129,000,000   $ 132,000,000
Outstanding balance of commercial loans classified under credit risk, minimum amount 500,000    
Interest income recognized on nonaccrual loans 17,000 $ 13,000  
Industrial, Manufacturing and Production [Member] | Commercial Real Estate and Commercial Lessors [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral dependent exposures 79,000,000    
Healthcare Facilities [Member] | Commercial Real Estate and Commercial Lessors [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral dependent exposures 47,000,000    
Warehouses [Member] | Commercial Real Estate and Commercial Lessors [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral dependent exposures 39,000,000    
Residential Investment Property [Member] | Commercial Real Estate and Commercial Lessors [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral dependent exposures 34,000,000    
Animal Feed Production [Member] | Commercial Real Estate and Commercial Lessors [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral dependent exposures $ 25,000,000