SEGMENT DISCLOSURE - Assets and Capital Expenditures and Loan Originations (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment disclosure
Total assets	$ 1,637,955		$ 2,022,884
Total capital expenditures	12,271	$ 19,416
Loan originations	23,875	49,976
Total capital expenditures and loan originations (4)	36,146	69,392
Reportable segments | Office
Segment disclosure
Total assets	1,235,540		1,568,702
Total capital expenditures	11,973	18,839
Reportable segments | Hotel
Segment disclosure
Total assets	110,655		115,955
Total capital expenditures	74	336
Reportable segments | Multi-family
Segment disclosure
Total assets	107,412		170,159
Total capital expenditures	224	$ 241
Reportable segments | Lending
Segment disclosure
Total assets	86,307		91,191
Non-segment
Segment disclosure
Total assets	$ 98,041		$ 76,877