v3.26.3
Loans - Schedule of Collateral-dependent Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Collateral dependent loans $ 6,031 $ 10,905
Consumer Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Collateral dependent loans 2,323 4,016
Agricultural Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Collateral dependent loans 3,590 1,433
Agricultural [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Collateral dependent loans 110 5,261
Commercial Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Collateral dependent loans   141
Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Collateral dependent loans   40
Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Collateral dependent loans $ 8 $ 14