DERIVATIVE INSTRUMENTS (Summary of Derivative Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains of derivative instruments	$ 4,587	$ 1,960
Derivative assets	5,797	6,865
Total return swaps
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains of derivative instruments	3,154	3,255
Net proceeds from derivative instrument	2,500	3,000
Derivative assets	1,130	2,347
Basis swaps
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains of derivative instruments	449	196
Net payments for derivative instrument		100
Derivative assets	808	439
Interest rate caps
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains of derivative instruments	210	(765)
Derivative assets	998	788
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains of derivative instruments	422	(726)
Net proceeds from derivative instrument	500
Net payments for derivative instrument		300
Derivative assets	2,674	$ 3,291
Two interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Net proceeds from derivative instrument	300
Two interest rate swaps | Other assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative assets	300
Foreign currency forward exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains of derivative instruments	352
Derivative assets	$ 187