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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 125 | $ 188 |  |
Allowance for loan losses, Collectively evaluated for impairment | 12,883 | 12,942 |  |
Allowance for loan losses, Total | 13,134 | 13,305 | $ 14,361 | $ 14,268
Outstanding loan balances, Individually evaluated for impairment | 3,460 | 6,539 |  |
Outstanding loan balances, Collectively evaluated for impairment | 1,160,986 | 1,048,711 |  |
Outstanding loan balances, Total | 1,164,661 | 1,055,506 |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration | 126 | 175 |  |
Loan balance of loans acquired with credit deterioration | 215 | 256 |  |
Commercial and Agriculture [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 4 | 82 |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,476 | 1,850 |  |
Allowance for loan losses, Total | 1,562 | 2,018 | 1,478 | 1,819
Outstanding loan balances, Individually evaluated for impairment | 438 | 1,983 |  |
Outstanding loan balances, Collectively evaluated for impairment | 151,948 | 133,391 |  |
Outstanding loan balances, Total | 152,473 | 135,462 |  |
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration | 82 | 86 |  |
Loan balance of loans acquired with credit deterioration | 87 | 88 |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 6 | 4 |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,037 | 2,167 |  |
Allowance for loan losses, Total | 2,043 | 2,171 | 2,467 | 2,221
Outstanding loan balances, Individually evaluated for impairment | 1,010 | 1,896 |  |
Outstanding loan balances, Collectively evaluated for impairment | 163,089 | 159,468 |  |
Outstanding loan balances, Total | 164,099 | 161,364 |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 5,307 | 4,606 |  |
Allowance for loan losses, Total | 5,307 | 4,606 | 4,657 | 4,334
Outstanding loan balances, Individually evaluated for impairment | 44 | 359 |  |
Outstanding loan balances, Collectively evaluated for impairment | 425,579 | 395,572 |  |
Outstanding loan balances, Total | 425,623 | 395,931 |  |
Residential Real Estate [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 109 | 102 |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,757 | 2,898 |  |
Allowance for loan losses, Total | 1,910 | 3,089 | 4,086 | 3,747
Outstanding loan balances, Individually evaluated for impairment | 1,360 | 1,686 |  |
Outstanding loan balances, Collectively evaluated for impairment | 267,247 | 245,454 |  |
Outstanding loan balances, Total | 268,735 | 247,308 |  |
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans acquired with credit deterioration | 44 | 89 |  |
Loan balance of loans acquired with credit deterioration | 128 | 168 |  |
Real Estate Construction [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 834 | 420 |  |
Allowance for loan losses, Total | 834 | 420 | 371 | 428
Outstanding loan balances, Collectively evaluated for impairment | 97,531 | 56,293 |  |
Outstanding loan balances, Total | 97,531 | 56,293 |  |
Farm Real Estate [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 6 |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 424 | 442 |  |
Allowance for loan losses, Total | 430 | 442 | 538 | 822
Outstanding loan balances, Individually evaluated for impairment | 608 | 614 |  |
Outstanding loan balances, Collectively evaluated for impairment | 38,853 | 40,556 |  |
Outstanding loan balances, Total | 39,461 | 41,170 |  |
Consumer and Other [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 290 | 314 |  |
Allowance for loan losses, Total | 290 | 314 | 382 | 200
Outstanding loan balances, Individually evaluated for impairment |  | 1 |  |
Outstanding loan balances, Collectively evaluated for impairment | 16,739 | 17,977 |  |
Outstanding loan balances, Total | 16,739 | 17,978 |  |
Unallocated [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 758 | 245 |  |
Allowance for loan losses, Total | $ 758 | $ 245 | $ 382 | $ 697

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