COMMITMENTS AND CONTINGENCIES (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) officer	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Commitments and contingencies
Outstanding loan commitments to fund loans		$ 7,607,000		$ 7,607,000
Future obligations under leases to fund tenant improvements and other future construction obligation		9,716,000		9,716,000
Assets held-for-sale		396,000		396,000
Restricted cash		10,824,000	$ 22,800,000	10,824,000	$ 22,800,000	$ 22,512,000
Right-of use asset		234,000		234,000
Lease liability		234,000		234,000
Rent expense		79,000		155,000
Rent expense			$ 62,000		$ 117,000
Minimum lease payments for remainder of fiscal year		128,000		128,000
Minimum lease payments for year ended December 31, 2020		$ 106,000		$ 106,000
Employment agreements | Executive Officers
Commitments and contingencies
Number of officers covered under employment agreement | officer				2
Multiplier used for the calculation of payments in the event of death of employee		2		2
Multiplier used for the calculation of payments in the event of disability to employee		1		1
Restricted Cash for Tenant Improvements
Commitments and contingencies
Restricted cash		$ 2,813,000		$ 2,813,000
City and County of San Francisco Real Property Transfer Tax Case | Pending Litigation
Commitments and contingencies
Refund sought for penalties, interest and legal fees paid for real property transfer tax	$ 11,845,000