FAIR VALUE OF FINANCIAL INSTRUMENTS (Unobservable Inputs Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Junior Subordinated Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 112,774	$ 96,852	$ 98,707	$ 95,200
Liabilities (gains) losses	336	428	14,403	2,080
Ending balance	113,110	97,280	113,110	97,280
TPS Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	25,540	21,568
Assets gains (losses), including OTTI	86	107
Ending balance	25,626	21,675	25,626	21,675
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			3,568	532
Ending balance	$ 25,626	$ 21,675	$ 25,626	$ 21,675