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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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