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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Commitments and Conditional Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Home equity lines of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund $ 147,667 $ 139,281
1-4 family residential construction loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund 13,679 11,420
Commercial real estate, construction and land development loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund 36,406 44,592
Commercial, industrial and other loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund 136,545 145,394
Standby letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund $ 13,806 $ 12,273