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Allowance for Credit Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | $ 35,280,000 | $ 35,149,000 | $ 28,511,000 |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  | 7,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 28,495,000 |  |  |
Allowance for loan losses, Total |  |  | 28,511,000 | $ 27,773,000 | $ 27,435,000 | $ 26,641,000
Outstanding loan balances, Individually evaluated for impairment |  |  | 624,000 |  |  |
Outstanding loan balances, Collectively evaluated for impairment |  |  | 2,541,657,000 |  |  |
Outstanding loan balances, Total | 2,754,890,000 |  | 2,546,666,000 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration |  |  | 9,000 |  |  |
Loan balance of loans acquired with credit deterioration |  |  | 4,385,000 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 5,156,000 | 5,540,000 | 3,011,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 3,005,000 |  |  |
Allowance for loan losses, Total |  |  | 3,011,000 | 2,729,000 | 2,790,000 | 2,600,000
Outstanding loan balances, Collectively evaluated for impairment |  |  | 277,732,000 |  |  |
Outstanding loan balances, Total | 301,877,000 |  | 278,595,000 |  |  |
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration |  |  | 6,000 |  |  |
Loan balance of loans acquired with credit deterioration |  |  | 863,000 |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 5,481,000 | 5,531,000 | 4,565,000 |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  | 6,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 4,556,000 |  |  |
Allowance for loan losses, Total |  |  | 4,565,000 | 4,926,000 | 4,729,000 | 4,464,000
Outstanding loan balances, Individually evaluated for impairment |  |  | 232,000 |  |  |
Outstanding loan balances, Collectively evaluated for impairment |  |  | 368,927,000 |  |  |
Outstanding loan balances, Total | 375,851,000 |  | 371,147,000 |  |  |
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 |  |  | 3,000 |  |  |
Loan balance of loans acquired with credit deterioration |  |  | 1,988,000 |  |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 11,555,000 | 11,646,000 | 14,138,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 14,138,000 |  |  |
Allowance for loan losses, Total |  |  | 14,138,000 | 14,427,000 | 14,711,000 | 13,860,000
Outstanding loan balances, Collectively evaluated for impairment |  |  | 1,018,617,000 |  |  |
Outstanding loan balances, Total | 1,102,932,000 |  | 1,018,736,000 |  |  |
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 |  |  | 119,000 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 6,831,000 | 6,515,000 | 3,145,000 |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  | 1,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 3,144,000 |  |  |
Allowance for loan losses, Total |  |  | 3,145,000 | 3,036,000 | 2,859,000 | 2,597,000
Outstanding loan balances, Individually evaluated for impairment |  |  | 392,000 |  |  |
Outstanding loan balances, Collectively evaluated for impairment |  |  | 550,975,000 |  |  |
Outstanding loan balances, Total | 614,304,000 |  | 552,781,000 |  |  |
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 |  |  | 1,414,000 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 3,739,000 | 3,447,000 | 2,293,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 2,293,000 |  |  |
Allowance for loan losses, Total |  |  | 2,293,000 | 2,013,000 | 1,969,000 | 1,810,000
Outstanding loan balances, Collectively evaluated for impairment |  |  | 243,127,000 |  |  |
Outstanding loan balances, Total | 269,291,000 |  | 243,127,000 |  |  |
Farm Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 227,000 | 243,000 | 291,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 291,000 |  |  |
Allowance for loan losses, Total |  |  | 291,000 | 251,000 | 236,000 | 287,000
Outstanding loan balances, Collectively evaluated for impairment |  |  | 24,708,000 |  |  |
Outstanding loan balances, Total | 24,109,000 |  | 24,708,000 |  |  |
Lease Financing Receivables [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 1,832,000 | 1,947,000 | 429,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 429,000 |  |  |
Allowance for loan losses, Total |  |  | 429,000 |  |  |
Outstanding loan balances, Collectively evaluated for impairment |  |  | 36,797,000 |  |  |
Outstanding loan balances, Total | 48,259,000 |  | 36,797,000 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 248,000 | 272,000 | 98,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 98,000 |  |  |
Allowance for loan losses, Total |  |  | 98,000 | 142,000 | 130,000 | 176,000
Outstanding loan balances, Collectively evaluated for impairment |  |  | 20,774,000 |  |  |
Outstanding loan balances, Total | 18,267,000 |  | 20,775,000 |  |  |
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 |  |  | 1,000 |  |  |
Unallocated [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | $ 211,000 | $ 8,000 | 541,000 |  |  |
Allowance for loan losses, Collectively evaluated for impairment |  |  | 541,000 |  |  |
Allowance for loan losses, Total |  |  | $ 541,000 | $ 249,000 | $ 11,000 | $ 847,000

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