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Allowance for Loan Losses - Summary of Nonaccrual Loans Excluding Purchased Credit-Impaired (PCI) Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | $ 4,398 | $ 6,132
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 856 | 887
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 810 | 1,476
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 252 | 711
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 2,261 | 2,778
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 27 | 27
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 181 | 186
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | $ 11 | $ 67

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