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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Schedule of Commitments and Conditional Obligations (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Home equity lines of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | $ 139,281 | $ 126,811
1-4 family residential construction loans |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | 11,420 | 7,820
Commercial real estate, construction and land development loans |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | 44,592 | 43,830
Commercial, industrial and other loans |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | 145,394 | 111,884
Standby letters of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract or Notional Amount | $ 12,273 | $ 7,097

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