v3.25.2
Servicing - Additional Information (Detail)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Loan
Strata
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]      
Valuation allowance $ 87   $ 97
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 362,800 $ 363,400 364,300
Capitalized service right assets included in other assets 3,500 3,500 3,500
Fair value of the capitalized servicing rights $ 4,700 $ 5,300 $ 4,800
Prepayment rate 7.70% 6.10% 8.10%
Number of strata which included loan | Strata 2    
Number of loans | Loan 3,629    
Discount yield 5.52%    
Valuation allowance $ 3   $ 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 146,800 $ 138,500 141,900
Capitalized service right assets included in other assets 2,300 2,000 2,100
Fair value of the capitalized servicing rights $ 2,300 $ 2,600 $ 2,700
Prepayment rate 0.447% 0.215% 0.184%
Number of strata which included loan | Strata 12    
Number of loans | Loan 643    
Discount yield 8.37%    
Valuation allowance $ 84   $ 95
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 77    
Eleven 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 147