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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, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 73 |  | $ 107 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 26,495 |  | 24,921 |  |  |
Allowance for loan losses, Total | 26,568 | $ 26,197 | 25,028 | $ 22,637 | $ 20,420 | $ 14,767
Outstanding loan balances, Individually evaluated for impairment | 1,272 |  | 2,666 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 2,003,246 |  | 2,054,448 |  |  |
Outstanding loan balances, Total | 2,004,814 |  | 2,057,502 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loan balance of loans acquired with credit deterioration | 296 |  | 388 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  | 73 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,512 |  | 2,737 |  |  |
Allowance for loan losses, Total | 2,512 | 2,320 | 2,810 | 2,661 | 2,799 | 2,219
Outstanding loan balances, Individually evaluated for impairment |  |  | 74 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 276,741 |  | 409,802 |  |  |
Outstanding loan balances, Total | 276,741 |  | 409,876 |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 55 |  | 5 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 4,361 |  | 4,052 |  |  |
Allowance for loan losses, Total | 4,416 | 4,027 | 4,057 | 3,955 | 3,411 | 2,541
Outstanding loan balances, Individually evaluated for impairment | 205 |  | 980 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 292,520 |  | 277,433 |  |  |
Outstanding loan balances, Total | 292,725 |  | 278,413 |  |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 13,170 |  | 12,451 |  |  |
Allowance for loan losses, Total | 13,170 | 13,546 | 12,451 | 10,578 | 9,169 | 6,584
Outstanding loan balances, Individually evaluated for impairment |  |  | 48 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 788,898 |  | 705,024 |  |  |
Outstanding loan balances, Total | 788,898 |  | 705,072 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 18 |  | 29 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,578 |  | 2,455 |  |  |
Allowance for loan losses, Total | 2,596 | 2,531 | 2,484 | 2,457 | 2,434 | 1,582
Outstanding loan balances, Individually evaluated for impairment | 545 |  | 946 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 423,712 |  | 441,254 |  |  |
Outstanding loan balances, Total | 424,553 |  | 442,588 |  |  |
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 | 296 |  | 388 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,459 |  | 2,439 |  |  |
Allowance for loan losses, Total | 2,459 | 2,177 | 2,439 | 2,345 | 1,844 | 1,250
Outstanding loan balances, Collectively evaluated for impairment | 179,491 |  | 175,609 |  |  |
Outstanding loan balances, Total | 179,491 |  | 175,609 |  |  |
Farm Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 308 |  | 338 |  |  |
Allowance for loan losses, Total | 308 | 290 | 338 | 360 | 361 | 344
Outstanding loan balances, Individually evaluated for impairment | 522 |  | 618 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 29,625 |  | 32,484 |  |  |
Outstanding loan balances, Total | 30,147 |  | 33,102 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 212 |  | 209 |  |  |
Allowance for loan losses, Total | 212 | 202 | 209 | 220 | 247 | $ 247
Outstanding loan balances, Collectively evaluated for impairment | 12,259 |  | 12,842 |  |  |
Outstanding loan balances, Total | 12,259 |  | 12,842 |  |  |
Unallocated [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 895 |  | 240 |  |  |
Allowance for loan losses, Total | $ 895 | $ 1,104 | $ 240 | $ 61 | $ 155 |

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