VARIABLE INTEREST ENTITIES (VIE) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 loan	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Liabilities	$ 6,571,664		$ 6,571,664		$ 6,431,364
Financing receivable, approved modifications, number of loans | loan	2	0	2	0
COVID-19
Variable Interest Entity [Line Items]
Financing receivable, approved modifications, number of loans | loan			271
Financing receivable, approved modifications, percent	6.40%		6.40%
Financing receivable, modifications, amount	$ 398,400		$ 398,400
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure as a percentage of original principal amount			10.00%
Maximum loss exposure	62,600		$ 62,600
Liabilities	$ 959		$ 959		$ 1,000
Variable Interest Entity, Not Primary Beneficiary | COVID-19
Variable Interest Entity [Line Items]
Financing receivable, approved modifications, number of loans | loan			4
Financing receivable, approved modifications, percent	2.10%		2.10%
Financing receivable, modifications, amount	$ 5,600		$ 5,600