FAIR VALUE OF FINANCIAL INSTRUMENTS (Unobservable Inputs Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 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	$ 28,038		$ 28,038			$ 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	(363)	$ 3,299	(2,647)	$ 5,025
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative assets	0	5,816	0	5,816	$ 2,937	$ 5,221	$ 2,517	$ 791
Junior Subordinated Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	117,248	99,795	116,974	119,304
Liabilities (gains) losses	272	9,818	546	(9,691)
Ending balance	117,520	109,613	117,520	109,613
TPS Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	25,039	21,040
Assets gains (losses), including OTTI	58	2,199
Ending balance	25,097	23,239	25,097	23,239
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			117	(2,397)
Ending balance	$ 25,097	$ 23,239	$ 25,097	$ 23,239