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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, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 119 |  | $ 125 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 12,719 |  | 12,883 |  |  |
Allowance for loan losses, Total | 12,867 | $ 12,814 | 13,134 | $ 13,047 | $ 13,300 | $ 13,305
Outstanding loan balances, Individually evaluated for impairment | 3,602 |  | 3,460 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 1,176,261 |  | 1,160,986 |  |  |
Outstanding loan balances, Total | 1,180,032 |  | 1,164,661 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans acquired with credit deterioration | 29 |  | 126 |  |  |
Loan balance of loans acquired with credit deterioration | 169 |  | 215 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 5 |  | 4 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,625 |  | 1,476 |  |  |
Allowance for loan losses, Total | 1,630 | 1,359 | 1,562 | 1,608 | 1,569 | 2,018
Outstanding loan balances, Individually evaluated for impairment | 961 |  | 438 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 152,720 |  | 151,948 |  |  |
Outstanding loan balances, Total | 153,742 |  | 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 | 61 |  | 87 |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 8 |  | 6 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,153 |  | 2,037 |  |  |
Allowance for loan losses, Total | 2,161 | 2,030 | 2,043 | 2,010 | 2,259 | 2,171
Outstanding loan balances, Individually evaluated for impairment | 517 |  | 1,010 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 169,228 |  | 163,089 |  |  |
Outstanding loan balances, Total | 169,745 |  | 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 | 5,135 |  | 5,307 |  |  |
Allowance for loan losses, Total | 5,135 | 5,670 | 5,307 | 4,739 | 4,543 | 4,606
Outstanding loan balances, Individually evaluated for impairment | 39 |  | 44 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 431,056 |  | 425,579 |  |  |
Outstanding loan balances, Total | 431,095 |  | 425,623 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 100 |  | 109 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,562 |  | 1,757 |  |  |
Allowance for loan losses, Total | 1,691 | 1,750 | 1,910 | 2,676 | 3,022 | 3,089
Outstanding loan balances, Individually evaluated for impairment | 1,307 |  | 1,360 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 269,792 |  | 267,247 |  |  |
Outstanding loan balances, Total | 271,207 |  | 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 | 29 |  | 44 |  |  |
Loan balance of loans acquired with credit deterioration | 108 |  | 128 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 861 |  | 834 |  |  |
Allowance for loan losses, Total | 861 | 820 | 834 | 482 | 413 | 420
Outstanding loan balances, Collectively evaluated for impairment | 100,812 |  | 97,531 |  |  |
Outstanding loan balances, Total | 100,812 |  | 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 | 404 |  | 424 |  |  |
Allowance for loan losses, Total | 410 | 411 | 430 | 425 | 407 | 442
Outstanding loan balances, Individually evaluated for impairment | 778 |  | 608 |  |  |
Outstanding loan balances, Collectively evaluated for impairment | 37,067 |  | 38,853 |  |  |
Outstanding loan balances, Total | 37,845 |  | 39,461 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 300 |  | 290 |  |  |
Allowance for loan losses, Total | 300 | 247 | 290 | 324 | 354 | 314
Outstanding loan balances, Collectively evaluated for impairment | 15,586 |  | 16,739 |  |  |
Outstanding loan balances, Total | 15,586 |  | 16,739 |  |  |
Unallocated [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 679 |  | 758 |  |  |
Allowance for loan losses, Total | $ 679 | $ 527 | $ 758 | $ 783 | $ 733 | $ 245

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