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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 14 |  | $ 18 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 27,421 |  | 26,623 |  |  |
Allowance for loan losses, Total | 27,435 | $ 27,033 | 26,641 | $ 26,197 | $ 26,133 | $ 25,028
Outstanding loan balances, Individually evaluated for impairment | 1,088 |  | 1,222 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 2,062,857 |  | 1,996,367 |  |  |
Outstanding loan balances, Total | 2,064,221 |  | 1,997,879 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loan balance of loans acquired with credit deterioration | 276 |  | 290 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,790 |  | 2,600 |  |  |
Allowance for loan losses, Total | 2,790 | 2,584 | 2,600 | 2,320 | 2,360 | 2,810
Outstanding loan balances, Collectively evaluated for impairment | 226,540 |  | 246,502 |  |  |
Outstanding loan balances, Total | 226,540 |  | 246,502 |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 6 |  | 7 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 4,723 |  | 4,457 |  |  |
Allowance for loan losses, Total | 4,729 | 4,594 | 4,464 | 4,027 | 4,049 | 4,057
Outstanding loan balances, Individually evaluated for impairment | 175 |  | 187 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 304,297 |  | 295,265 |  |  |
Outstanding loan balances, Total | 304,472 |  | 295,452 |  |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 14,711 |  | 13,860 |  |  |
Allowance for loan losses, Total | 14,711 | 14,577 | 13,860 | 13,546 | 13,209 | 12,451
Outstanding loan balances, Individually evaluated for impairment |  |  | 0 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 876,695 |  | 829,310 |  |  |
Outstanding loan balances, Total | 876,695 |  | 829,310 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 8 |  | 11 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,851 |  | 2,586 |  |  |
Allowance for loan losses, Total | 2,859 | 2,612 | 2,597 | 2,531 | 2,509 | 2,484
Outstanding loan balances, Individually evaluated for impairment | 419 |  | 526 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 451,933 |  | 429,244 |  |  |
Outstanding loan balances, Total | 452,628 |  | 430,060 |  |  |
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 | 276 |  | 290 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,969 |  | 1,810 |  |  |
Allowance for loan losses, Total | 1,969 | 1,863 | 1,810 | 2,177 | 2,902 | 2,439
Outstanding loan balances, Collectively evaluated for impairment | 170,633 |  | 157,127 |  |  |
Outstanding loan balances, Total | 170,633 |  | 157,127 |  |  |
Farm Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 236 |  | 287 |  |  |
Allowance for loan losses, Total | 236 | 249 | 287 | 290 | 283 | 338
Outstanding loan balances, Individually evaluated for impairment | 494 |  | 509 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 22,801 |  | 27,910 |  |  |
Outstanding loan balances, Total | 23,295 |  | 28,419 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 130 |  | 176 |  |  |
Allowance for loan losses, Total | 130 | 136 | 176 | 202 | 170 | 209
Outstanding loan balances, Collectively evaluated for impairment | 9,958 |  | 11,009 |  |  |
Outstanding loan balances, Total | 9,958 |  | 11,009 |  |  |
Unallocated [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 11 |  | 847 |  |  |
Allowance for loan losses, Total | $ 11 | $ 418 | $ 847 | $ 1,104 | $ 651 | $ 240

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