DERIVATIVE FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on the Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)	$ 630	$ (764)
Interest income | Interest Rate Products
Derivative [Line Items]
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)	630	(764)
Derivatives not designated as hedging instruments
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income	398	1,017
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	632	1,100
Derivatives not designated as hedging instruments | Mortgage banking activities, net | Forward sale commitments
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income	$ (234)	$ (83)