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DERIVATIVE FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on the Income Statement (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative [Line Items]        
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion) $ (368)   $ (2,005)  
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)   $ 109   $ (1,119)
Interest income | Interest Rate Products        
Derivative [Line Items]        
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion) (368)   (2,005)  
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)   109   (1,119)
Derivatives not designated as hedging instruments        
Derivative [Line Items]        
Amount of Gain or (Loss) Recognized in Income (159) 16 293 (612)
Derivatives not designated as hedging instruments | Mortgage banking activities, net | Interest rate lock commitments with customers        
Derivative [Line Items]        
Amount of Gain or (Loss) Recognized in Income 322 192 1,496 (104)
Derivatives not designated as hedging instruments | Mortgage banking activities, net | Forward sale commitments        
Derivative [Line Items]        
Amount of Gain or (Loss) Recognized in Income $ (481) $ (176) $ (1,203) $ (508)