DISCONTINUED OPERATIONS - Narrative (Details) $ in Thousands		12 Months Ended
	Dec. 17, 2015 USD ($)	Dec. 31, 2017 USD ($) property	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 29, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of assets held for sale		$ 0	$ 0	$ 5,151
Lending division
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Carrying value			27,587
Gain on disposition of assets held for sale			0	5,151
Lending division | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs from sales			$ 6	$ 675
Lending Segment, Commercial Mortgage Loans [Member] | Discontinued operations, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Carrying value	$ 77,121
Gain on disposition of assets held for sale	$ 5,151
Commercial Real Estate Subsidiary [Member] | Discontinued operations, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Carrying value					$ 27,587
Multifamily
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number Of Properties Sold | property		5