SEGMENT DISCLOSURE - Assets and Capital Expenditures and Loan Originations (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment disclosure
Total assets	$ 1,591,304		$ 2,022,884
Total capital expenditures	23,237	$ 25,183
Loan originations	49,532	78,809
Total capital expenditures and loan originations	72,769	103,992
Reportable segments | Office
Segment disclosure
Total assets	1,135,614		1,568,702
Total capital expenditures	22,632	24,115
Reportable segments | Hotel
Segment disclosure
Total assets	111,899		115,955
Total capital expenditures	267	619
Reportable segments | Multi-family
Segment disclosure
Total assets	45,774		170,159
Total capital expenditures	338	$ 449
Reportable segments | Lending
Segment disclosure
Total assets	88,293		91,191
Non-segment
Segment disclosure
Total assets	$ 209,724		$ 76,877