DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Net Gains (Losses) Relating to Free-Standing Derivative Instruments (Details) - Mortgage banking derivative instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Forward contracts related to mortgage loans held for sale
Derivative [Line Items]
Gain (loss) on derivative instruments, net, pretax, total	$ (1,276)	$ (12)	$ 1,285
Interest rate lock commitments
Derivative [Line Items]
Gain (loss) on derivative instruments, net, pretax, total	$ 2,537	$ 2,833	$ 3,029