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LOANS AND ALLOWANCE FOR LOAN LOSSES - Schedule of Number of Loans Modified (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract |  | 4
Pre- Modification Investment Balance |  | $ 6,394
Post- Modification Investment Balance |  | $ 6,394
Commercial Real Estate | Owner-occupied |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 2 |
Pre- Modification Investment Balance | $ 119 |
Post- Modification Investment Balance | $ 119 |
Commercial Real Estate | Non-owner occupied |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract |  | 1
Pre- Modification Investment Balance |  | $ 6,095
Post- Modification Investment Balance |  | $ 6,095
Residential mortgage | First lien |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract |  | 2
Pre- Modification Investment Balance |  | $ 265
Post- Modification Investment Balance |  | $ 265
Residential mortgage | Home equity - lines of credit |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract |  | 1
Pre- Modification Investment Balance |  | $ 34
Post- Modification Investment Balance |  | $ 34

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