SEGMENT DISCLOSURE - Assets and Capital Expenditures and Loan Originations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment disclosure
Total assets	$ 1,357,984		$ 1,336,388
Total capital expenditures	9,191	$ 6,981
Loan originations	11,641	8,404
Total capital expenditures and loan originations	20,832	15,385
Reportable segments | Office
Segment disclosure
Total assets	1,138,818		997,808
Total capital expenditures	8,710	6,805
Reportable segments | Hotel
Segment disclosure
Total assets	109,617		107,790
Total capital expenditures	481	46
Reportable segments | Multi-family
Segment disclosure
Total assets	0		815
Total capital expenditures	0	$ 130
Reportable segments | Lending
Segment disclosure
Total assets	93,947		92,919
Non-segment
Segment disclosure
Total assets	$ 15,602		$ 137,056