FAIR VALUE OF FINANCIAL INSTRUMENTS (Unobservable Inputs Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Interest rate swaps [Member] | Recurring [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative assets	$ 43,506		$ 43,506			$ 1,108
Interest rate swaps [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets gains (losses), including OTTI	2,638	$ 33	7,663	$ 1,133
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative assets	0	1,406	0	1,406	$ 5,816	$ 791	$ 1,373	$ 273
Junior Subordinated Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	109,613	113,621	119,304	114,091
Liabilities (gains) losses	208	(204)	(9,483)	(674)
Ending balance	109,821	113,417	109,821	113,417
TPS Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	23,239	25,741
Assets gains (losses), including OTTI	37	(69)
Ending balance	23,276	25,672	23,276	25,672
TPS and TRUP CDOs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			25,636	25,896
Assets gains (losses), including OTTI			(2,360)	(224)
Ending balance	$ 23,276	$ 25,672	$ 23,276	$ 25,672