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DERIVATIVES - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jul. 06, 2016
Interest rate swaps | Interest expense      
Derivative [Line Items]      
Amounts recorded to interest expense $ 403,000 $ 77,000  
Interest rate swaps | Cash flow hedging | Designated as hedging instrument      
Derivative [Line Items]      
Fair value of swaps $ 1,100,000 $ 1,100,000  
Interest rate swap, repurchase agreements | Cash flow hedging | Designated as hedging instrument      
Derivative [Line Items]      
Notional amount     $ 12,500,000.0
Fixed pay rate 0.993%    
Interest rate swap, FHLB advances | Cash flow hedging | Designated as hedging instrument      
Derivative [Line Items]      
Notional amount     $ 15,000,000.0
Fixed pay rate 1.043%