FAIR VALUE OF FINANCIAL INSTRUMENTS (Unobservable Inputs Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Junior Subordinated Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 96,852	$ 93,298	$ 95,200	$ 92,480
Liabilities (gains) losses	428	1,066	2,080	1,884
Purchases, issuances and settlements, including acquisitions		0		0
Ending balance	97,280	94,364	97,280	94,364
TPS Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	21,568	20,645
Assets gains (losses), including OTTI	107	280
Purchases, issuances and settlements, including acquisitions		0
Ending balance	21,675	20,925	21,675	20,925
TPS and TRUP CDOs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			21,143	18,699
Assets gains (losses), including OTTI			532	501
Purchases, issuances and settlements, including acquisitions				1,725
Ending balance	$ 21,675	$ 20,925	$ 21,675	$ 20,925