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SALE OF COMMERCIAL REAL ESTATE BUSINESS - Carrying Value of Assets and Liabilities of CRE Business (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	[1]
Disposal Group, Including Discontinued Operations, Assets [Abstract]
Total assets of disposal group held for sale	$ 238,042	$ 0
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Total liabilities of disposal group held for sale	159,508	$ 0
CRE Business | Discontinued Operations, Disposed of by Sale
Disposal Group, Including Discontinued Operations, Assets [Abstract]
Cash and cash equivalents	2,772
Securities	8,016
Assets transferred or pledged to securitization vehicles	52,684
Real estate, net	142,381
Intangible assets, net	6,573
Other assets	25,616
Total assets of disposal group held for sale	238,042
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Mortgages payable	113,362
Interest payable	347
Other liabilities	45,799
Total liabilities of disposal group held for sale	$ 159,508
[1] (1)Derived from the audited consolidated financial statements at December 31, 2020.

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