DERIVATIVE FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on the Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)	$ (109)	$ 42	$ (1,119)	$ 192
Interest income | Interest Rate Products
Derivative [Line Items]
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)	(109)	42	(1,119)	192
Derivatives not designated as hedging instruments
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income	16	0	(612)	0
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	192	0	(104)	0
Derivatives not designated as hedging instruments | Mortgage banking activities, net | Forward sale commitments
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income	$ (176)	$ 0	$ (508)	$ 0