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Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Contract | Dec. 31, 2016 USD ($) Contract | Dec. 31, 2015 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract | 1 | 9 | 1
Pre- Modification Outstanding Recorded Investment | $ 13 | $ 1,537 | $ 41
Post-Modification Outstanding Recorded Investment | $ 13 | $ 1,537 | $ 41
Commercial and Agriculture [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract |  | 4 |
Pre- Modification Outstanding Recorded Investment |  | $ 529 |
Post-Modification Outstanding Recorded Investment |  | $ 529 |
Residential Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract | 1 | 2 |
Pre- Modification Outstanding Recorded Investment | $ 13 | $ 308 |
Post-Modification Outstanding Recorded Investment | $ 13 | $ 308 |
Real Estate Construction [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract |  |  | 1
Pre- Modification Outstanding Recorded Investment |  |  | $ 41
Post-Modification Outstanding Recorded Investment |  |  | $ 41
Farm Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract |  | 3 |
Pre- Modification Outstanding Recorded Investment |  | $ 700 |
Post-Modification Outstanding Recorded Investment |  | $ 700 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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