DERIVATIVES - Schedule of Derivatives (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative assets	$ 10,893,000	$ 2,423,000
Derivative liabilities	29,389,000	697,000
Interest Rate Caps
Derivative [Line Items]
Derivative assets	3,000	2,423,000
Interest Rate Lock Commitments
Derivative [Line Items]
Derivative assets	10,851,000	0
Derivative liabilities	223,000	0
Forward Loan Sale Commitments
Derivative [Line Items]
Derivative assets	39,000	0
Interest Rate Swaps
Derivative [Line Items]
Derivative liabilities	5,245,000	0
Variation margin accounts	106,100,000	0
TBAs
Derivative [Line Items]
Derivative liabilities	$ 23,921,000	$ 697,000