FAIR VALUE OF FINANCIAL INSTRUMENTS (Unobservable Inputs Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Junior Subordinated Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 112,516	$ 96,040	$ 98,707	$ 95,200
Liabilities (gains) losses	258	812	14,067	1,652
Ending balance	112,774	96,852	112,774	96,852
TPS Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	25,474	21,361
Assets gains (losses), including OTTI	66	207
Ending balance	25,540	21,568	25,540	21,568
TPS and TRUP CDOs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			22,058	21,143
Assets gains (losses), including OTTI			3,482	425
Ending balance	$ 25,540	$ 21,568	$ 25,540	$ 21,568