FAIR VALUE OF FINANCIAL INSTRUMENTS (Unobservable Inputs Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Interest rate swaps [Member] | Recurring [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative assets	$ 25,627		$ 25,627			$ 5,641
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	(1,179)	$ 2,638	(3,826)	$ 7,663
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative assets	0	8,454	0	8,454	$ 2,574	$ 5,221	$ 5,816	$ 791
Junior Subordinated Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	117,520	109,613	116,974	119,304
Liabilities (gains) losses	7,333	208	7,879	(9,483)
Ending balance	124,853	109,821	124,853	109,821
TPS Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	25,097	23,239
Assets gains (losses), including OTTI	1,778	37
Ending balance	26,875	23,276	26,875	23,276
TPS and TRUP CDOs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			24,980	25,636
Assets gains (losses), including OTTI			1,895	(2,360)
Ending balance	$ 26,875	$ 23,276	$ 26,875	$ 23,276