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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Commitments and Conditional Obligations, Contract or Notional Amount (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Home equity lines of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund $ 201,353 $ 160,971
1-4 family residential construction loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund 26,630 13,002
Commercial real estate, construction and land development loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund 15,742 31,133
Commercial, industrial and other loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund 173,780 147,518
Standby letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund $ 14,604 $ 13,909