EQUITY - Change in OCI Recognized in Statement of Operations, Line Item (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investments, net									$ 0	$ 0	$ (613)
Interest expense deposits									(32,001)	(59,083)	(39,846)
Income tax expense/(benefit)	$ (6,124)	$ (1,821)	$ (841)	$ (102)	$ (6,788)	$ (5,517)	$ (5,369)	$ (4,917)	(8,888)	(22,591)	(37,537)
Net income attributable to the Company	$ (24,971)	$ (22,680)	$ 3,298	$ (800)	$ (21,244)	$ (19,962)	$ (19,380)	$ (19,442)	(45,153)	(80,028)	(80,384)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to the Company									49	360	220
Unrealized gain/(loss) on Investment securities available-for-sale | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investments, net									0	0	(596)
Income tax expense/(benefit)									0	0	170
Net income attributable to the Company									0	0	(426)
Unrealized gain/ (loss) on cash flow hedges, after 2017-12 adoption | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense deposits									70	508	907
Income tax expense/(benefit)									(21)	(148)	(261)
Net income attributable to the Company									$ (49)	$ (360)	$ (646)