DERIVATIVE FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on the Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative [Line Items]
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)	$ (246)	$ 263	$ (1,010)	$ 150
Interest income | Interest Rate Products
Derivative [Line Items]
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion)	(246)	263	(1,010)	150
Derivatives not designated as hedging instruments
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income	156	0	(628)	0
Derivatives not designated as hedging instruments | Mortgage banking activities, net | Interest rate lock commitment with customers
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income	96	0	(296)	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	$ 60	$ 0	$ (332)	$ 0