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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration $ 37,160 $ 28,511    
Allowance for loan losses, Individually evaluated for impairment   7    
Allowance for loan losses, Collectively evaluated for impairment   28,495    
Allowance for loan losses, Total   28,511 $ 26,641 $ 25,028
Outstanding loan balances, Individually evaluated for impairment   624    
Outstanding loan balances, Collectively evaluated for impairment   2,541,657    
Outstanding loan balances, Total 2,861,727 2,546,666    
Receivables Acquired with Deteriorated Credit Quality [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration   9    
Loan balance of loans acquired with credit deterioration 4,385 4,385    
Commercial and Agriculture [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration 7,587 3,011    
Allowance for loan losses, Collectively evaluated for impairment   3,005    
Allowance for loan losses, Total   3,011 2,600 2,810
Outstanding loan balances, Collectively evaluated for impairment   277,732    
Outstanding loan balances, Total 304,793 278,595    
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration   6    
Loan balance of loans acquired with credit deterioration   863    
Commercial Real Estate Owner Occupied [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration 4,723 4,565    
Allowance for loan losses, Individually evaluated for impairment   6    
Allowance for loan losses, Collectively evaluated for impairment   4,556    
Allowance for loan losses, Total   4,565 4,464 4,057
Outstanding loan balances, Individually evaluated for impairment   232    
Outstanding loan balances, Collectively evaluated for impairment   368,927    
Outstanding loan balances, Total 377,321 371,147    
Commercial Real Estate Owner Occupied [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration   3    
Loan balance of loans acquired with credit deterioration   1,988    
Commercial Real Estate Non Owner Occupied [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration 12,056 14,138    
Allowance for loan losses, Collectively evaluated for impairment   14,138    
Allowance for loan losses, Total   14,138 13,860 12,451
Outstanding loan balances, Collectively evaluated for impairment   1,018,617    
Outstanding loan balances, Total 1,161,894 1,018,736    
Commercial Real Estate Non Owner Occupied [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loan balance of loans acquired with credit deterioration   119    
Residential Real Estate [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration 8,489 3,145    
Allowance for loan losses, Individually evaluated for impairment   1    
Allowance for loan losses, Collectively evaluated for impairment   3,144    
Allowance for loan losses, Total   3,145 2,597 2,484
Outstanding loan balances, Individually evaluated for impairment   392    
Outstanding loan balances, Collectively evaluated for impairment   550,975    
Outstanding loan balances, Total 659,841 552,781    
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loan balance of loans acquired with credit deterioration   1,414    
Real Estate Construction [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration 3,388 2,293    
Allowance for loan losses, Collectively evaluated for impairment   2,293    
Allowance for loan losses, Total   2,293 1,810 2,439
Outstanding loan balances, Collectively evaluated for impairment   243,127    
Outstanding loan balances, Total 260,409 243,127    
Farm Real Estate [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration 260 291    
Allowance for loan losses, Collectively evaluated for impairment   291    
Allowance for loan losses, Total   291 287 338
Outstanding loan balances, Collectively evaluated for impairment   24,708    
Outstanding loan balances, Total 24,771 24,708    
Lease Financing Receivable [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration 297 429    
Allowance for loan losses, Collectively evaluated for impairment   429    
Allowance for loan losses, Total   429 0  
Outstanding loan balances, Collectively evaluated for impairment   36,797    
Outstanding loan balances, Total 54,642 36,797    
Consumer and Other [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration 341 98    
Allowance for loan losses, Collectively evaluated for impairment   98    
Allowance for loan losses, Total   98 176 209
Outstanding loan balances, Collectively evaluated for impairment   20,774    
Outstanding loan balances, Total 18,056 20,775    
Consumer and Other [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loan balance of loans acquired with credit deterioration   1    
Unallocated [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans acquired with credit deterioration $ 19 541    
Allowance for loan losses, Collectively evaluated for impairment   541    
Allowance for loan losses, Total   $ 541 $ 847 $ 240