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Servicing - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Loan
Strata
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Customer Securities for which Entity has Right to Sell or Repledge (Including Securities Sold or Repledged) [Line Items]      
Valuation allowance $ 48   $ 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 362,600 $ 363,600 364,300
Capitalized service right assets included in other assets 3,500 3,400 3,500
Fair value of the capitalized servicing rights $ 5,000 $ 5,500 $ 4,800
Prepayment rate 7.80% 5.40% 8.10%
Number of strata which included loan | Strata 2    
Number of loans | Loan 3,656    
Discount yield 5.77%    
Valuation allowance $ 2   $ 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 145,300 $ 132,900 141,900
Capitalized service right assets included in other assets 2,300 2,100 2,200
Fair value of the capitalized servicing rights $ 2,600 $ 2,100 $ 2,700
Prepayment rate 0.259% 0.596% 0.184%
Number of strata which included loan | Strata 11    
Number of loans | Loan 636    
Discount yield 8.54%    
Valuation allowance $ 46   $ 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 80    
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 34