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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, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 366 |  | $ 125 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 12,935 |  | 12,883 |  |  |
Allowance for loan losses, Total | 13,331 | $ 12,867 | 13,134 | $ 12,946 | $ 13,047 | $ 13,305
Outstanding loan balances, Individually evaluated for impairment | 3,953 |  | 3,460 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 1,510,676 |  | 1,160,986 |  |  |
Outstanding loan balances, Total | 1,515,644 |  | 1,164,661 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 30 |  | 126 |  |  |
Loan balance of loans acquired with credit deterioration | 1,015 |  | 215 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  | 4 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,631 |  | 1,476 |  |  |
Allowance for loan losses, Total | 1,631 | 1,630 | 1,562 | 1,611 | 1,608 | 2,018
Outstanding loan balances, Individually evaluated for impairment | 390 |  | 438 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 169,249 |  | 151,948 |  |  |
Outstanding loan balances, Total | 169,686 |  | 152,473 |  |  |
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration |  |  | 82 |  |  |
Loan balance of loans acquired with credit deterioration | 47 |  | 87 |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 10 |  | 6 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,033 |  | 2,037 |  |  |
Allowance for loan losses, Total | 2,043 | 2,161 | 2,043 | 2,073 | 2,010 | 2,171
Outstanding loan balances, Individually evaluated for impairment | 505 |  | 1,010 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 202,582 |  | 163,089 |  |  |
Outstanding loan balances, Total | 203,087 |  | 164,099 |  |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 5,445 |  | 5,307 |  |  |
Allowance for loan losses, Total | 5,445 | 5,135 | 5,307 | 5,273 | 4,739 | 4,606
Outstanding loan balances, Individually evaluated for impairment | 36 |  | 44 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 499,204 |  | 425,579 |  |  |
Outstanding loan balances, Total | 499,240 |  | 425,623 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 350 |  | 109 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,419 |  | 1,757 |  |  |
Allowance for loan losses, Total | 1,799 | 1,691 | 1,910 | 2,479 | 2,676 | 3,089
Outstanding loan balances, Individually evaluated for impairment | 2,315 |  | 1,360 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 455,738 |  | 267,247 |  |  |
Outstanding loan balances, Total | 459,021 |  | 268,735 |  |  |
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 30 |  | 44 |  |  |
Loan balance of loans acquired with credit deterioration | 968 |  | 128 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 981 |  | 834 |  |  |
Allowance for loan losses, Total | 981 | 861 | 834 | 667 | 482 | 420
Outstanding loan balances, Collectively evaluated for impairment | 126,288 |  | 97,531 |  |  |
Outstanding loan balances, Total | 126,288 |  | 97,531 |  |  |
Farm Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 6 |  | 6 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 387 |  | 424 |  |  |
Allowance for loan losses, Total | 393 | 410 | 430 | 424 | 425 | 442
Outstanding loan balances, Individually evaluated for impairment | 707 |  | 608 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 37,331 |  | 38,853 |  |  |
Outstanding loan balances, Total | 38,038 |  | 39,461 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 315 |  | 290 |  |  |
Allowance for loan losses, Total | 315 | 300 | 290 | 325 | 324 | 314
Outstanding loan balances, Collectively evaluated for impairment | 20,284 |  | 16,739 |  |  |
Outstanding loan balances, Total | 20,284 |  | 16,739 |  |  |
Unallocated [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 724 |  | 758 |  |  |
Allowance for loan losses, Total | $ 724 | $ 679 | $ 758 | $ 94 | $ 783 | $ 245

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