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Servicing - Additional Information (Detail)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Loan
Strata
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]      
Valuation Allowance $ 49   $ 7
1-4 Family Real Estate Loans [Member]      
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]      
Loans serviced for others unpaid principal amount 366,000 $ 368,200 367,800
Capitalized service right assets included in other assets 3,500   3,500
Fair value of the capitalized servicing rights $ 5,200 $ 5,300 $ 5,500
Prepayment rate 7.20% 6.50% 6.30%
Number of strata which included loan | Strata 2    
Number of loans | Loan 3,695    
Discount yield 5.27%    
Valuation Allowance $ 2    
Agricultural Real Estate Loans [Member]      
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]      
Loans serviced for others unpaid principal amount 140,300 $ 137,100 $ 135,800
Capitalized service right assets included in other assets 2,200   2,200
Fair value of the capitalized servicing rights $ 2,700 $ 2,300 $ 2,200
Prepayment rate 0.156% 1.209% 0.894%
Number of strata which included loan | Strata 12    
Number of loans | Loan 613    
Discount yield 8.51%    
Valuation Allowance $ 47    
Two 1-4 Family Real Estate Strata [Member]      
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]      
Number of loans | Loan 87    
Twelve Agricultural Real Estate Strata [Member]      
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]      
Number of loans | Loan 33