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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 7 |  | $ 18 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 27,766 |  | 26,623 |  |  |
Allowance for loan losses, Total | 27,773 | $ 27,435 | 26,641 | $ 26,568 | $ 26,197 | $ 25,028
Outstanding loan balances, Individually evaluated for impairment | 1,902 |  | 1,222 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 2,322,602 |  | 1,996,367 |  |  |
Outstanding loan balances, Total | 2,328,614 |  | 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 | 4,110 |  | 290 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,729 |  | 2,600 |  |  |
Allowance for loan losses, Total | 2,729 | 2,790 | 2,600 | 2,512 | 2,320 | 2,810
Outstanding loan balances, Individually evaluated for impairment | 343 |  |  |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 226,235 |  | 246,502 |  |  |
Outstanding loan balances, Total | 227,387 |  | 246,502 |  |  |
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loan balance of loans acquired with credit deterioration | 809 |  |  |  |  |
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 | 4,920 |  | 4,457 |  |  |
Allowance for loan losses, Total | 4,926 | 4,729 | 4,464 | 4,416 | 4,027 | 4,057
Outstanding loan balances, Individually evaluated for impairment | 833 |  | 187 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 361,865 |  | 295,265 |  |  |
Outstanding loan balances, Total | 364,468 |  | 295,452 |  |  |
Commercial Real Estate 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 | 1,770 |  |  |  |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 14,427 |  | 13,860 |  |  |
Allowance for loan losses, Total | 14,427 | 14,711 | 13,860 | 13,170 | 13,546 | 12,451
Outstanding loan balances, Individually evaluated for impairment | 140 |  | 0 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 955,909 |  | 829,310 |  |  |
Outstanding loan balances, Total | 956,169 |  | 829,310 |  |  |
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 | 120 |  |  |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 1 |  | 11 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 3,035 |  | 2,586 |  |  |
Allowance for loan losses, Total | 3,036 | 2,859 | 2,597 | 2,596 | 2,531 | 2,484
Outstanding loan balances, Individually evaluated for impairment | 586 |  | 526 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 529,168 |  | 429,244 |  |  |
Outstanding loan balances, Total | 531,164 |  | 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 | 1,410 |  | 290 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,013 |  | 1,810 |  |  |
Allowance for loan losses, Total | 2,013 | 1,969 | 1,810 | 2,459 | 2,177 | 2,439
Outstanding loan balances, Collectively evaluated for impairment | 202,793 |  | 157,127 |  |  |
Outstanding loan balances, Total | 202,793 |  | 157,127 |  |  |
Farm Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 251 |  | 287 |  |  |
Allowance for loan losses, Total | 251 | 236 | 287 | 308 | 290 | 338
Outstanding loan balances, Individually evaluated for impairment |  |  | 509 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 25,636 |  | 27,910 |  |  |
Outstanding loan balances, Total | 25,636 |  | 28,419 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 142 |  | 176 |  |  |
Allowance for loan losses, Total | 142 | 130 | 176 | 212 | 202 | 209
Outstanding loan balances, Collectively evaluated for impairment | 20,996 |  | 11,009 |  |  |
Outstanding loan balances, Total | 20,997 |  | 11,009 |  |  |
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] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 249 |  | 847 |  |  |
Allowance for loan losses, Total | $ 249 | $ 11 | $ 847 | $ 895 | $ 1,104 | $ 240

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