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Allowance for Loan Losses - Aging Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 4,205 | $ 6,111
Current | 1,137,559 | 1,049,139
Total Loans | 1,141,992 | 1,055,506
Past Due 90 Days and Accruing | 44 | 9
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 857 | 3,145
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 602 | 1,111
90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,746 | 1,855
Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Purchased Credit-Impaired Loans | 228 | 256
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,053 | 328
Current | 146,395 | 135,046
Total Loans | 147,537 | 135,462
Commercial and Agriculture [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 389 | 156
Commercial and Agriculture [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 20
Commercial and Agriculture [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 664 | 152
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Purchased Credit-Impaired Loans | 89 | 88
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 690 | 1,555
Current | 166,988 | 159,809
Total Loans | 167,678 | 161,364
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 722
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 174 | 553
Commercial Real Estate Owner Occupied [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 516 | 280
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 692 | 463
Current | 423,738 | 395,468
Total Loans | 424,430 | 395,931
Commercial Real Estate Non Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 164 | 147
Commercial Real Estate Non Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 108 |
Commercial Real Estate Non Owner Occupied [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 420 | 316
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,338 | 3,368
Current | 266,362 | 243,772
Total Loans | 267,839 | 247,308
Residential Real Estate [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 218 | 1,812
Residential Real Estate [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 242 | 507
Residential Real Estate [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 878 | 1,049
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Purchased Credit-Impaired Loans | 139 | 168
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 95 | 27
Current | 77,883 | 56,266
Total Loans | 77,978 | 56,293
Real Estate Construction [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 68 |
Real Estate Construction [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 27 | 27
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 193 | 93
Current | 38,773 | 41,077
Total Loans | 38,966 | 41,170
Farm Real Estate [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 93
Farm Real Estate [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 193 |
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 144 | 277
Current | 17,420 | 17,701
Total Loans | 17,564 | 17,978
Past Due 90 Days and Accruing | 44 | 9
Consumer and Other [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 86 | 215
Consumer and Other [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 10 | 31
Consumer and Other [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 48 | $ 31

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