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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK - Commitments and Conditional Obligations (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Home equity lines of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund $ 130,651 $ 126,811
1-4 family residential construction loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund 10,142 7,820
Commercial real estate, construction and land development loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund 37,315 43,830
Commercial, industrial and other loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund 122,771 111,884
Standby letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund $ 7,044 $ 7,097