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Allowance for Loan Losses - Aging Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 4,623 | $ 6,111
Current | 1,095,956 | 1,049,139
Total Loans | 1,100,817 | 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 | 1,500 | 3,145
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 849 | 1,111
90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,274 | 1,855
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 259 | 328
Current | 143,362 | 135,046
Total Loans | 143,708 | 135,462
Commercial and Agriculture [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 249 | 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 | 10 | 152
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,588 | 1,555
Current | 170,674 | 159,809
Total Loans | 172,262 | 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 | 334 | 722
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 640 | 553
Commercial Real Estate Owner Occupied [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 614 | 280
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 600 | 463
Current | 405,276 | 395,468
Total Loans | 405,876 | 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 |  | 147
Commercial Real Estate Non Owner Occupied [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 600 | 316
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,440 | 3,368
Current | 256,989 | 243,772
Total Loans | 258,580 | 247,308
Residential Real Estate [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 263 | 1,812
Residential Real Estate [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 198 | 507
Residential Real Estate [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 979 | 1,049
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 27 | 27
Current | 63,511 | 56,266
Total Loans | 63,538 | 56,293
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 | 504 | 93
Current | 38,565 | 41,077
Total Loans | 39,069 | 41,170
Farm Real Estate [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 504 | 93
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 205 | 277
Current | 17,579 | 17,701
Total Loans | 17,784 | 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 | 150 | 215
Consumer and Other [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 11 | 31
Consumer and Other [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 44 | 31
Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Purchased Credit-Impaired Loans | 238 | 256
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Purchased Credit-Impaired Loans | 87 | 88
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Purchased Credit-Impaired Loans | $ 151 | $ 168

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