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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

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