SEGMENT DISCLOSURE - Assets and Capital Expenditures and Loan Originations (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment disclosure
Total assets	$ 1,388,361		$ 1,336,388
Total capital expenditures	10,864	$ 12,271
Loan originations	28,460	23,875
Total capital expenditures and loan originations	39,324	36,146
Reportable segments | Office
Segment disclosure
Total assets	1,131,926		997,808
Total capital expenditures	10,040	11,973
Reportable segments | Hotel
Segment disclosure
Total assets	109,774		107,790
Total capital expenditures	824	74
Reportable segments | Lending
Segment disclosure
Total assets	95,175		92,919
Reportable segments | Multifamily
Segment disclosure
Total assets	0		815
Total capital expenditures	0	$ 224
Non-segment
Segment disclosure
Total assets	$ 51,486		$ 137,056