COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) officer	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Commitments and contingencies
Outstanding loan commitments to fund loans		$ 14,452		$ 14,452
Future obligations under leases to fund tenant improvements and other future construction obligation		8,827		8,827
Restricted cash	$ 21,524	11,507	$ 21,524	11,507	$ 21,524	$ 22,512
Right-of use asset		170		170
Lease liability		170		170
Rent expense		69		224
Rent expense			$ 65		$ 182
Minimum lease payments for remainder of fiscal year		64		64
Minimum lease payments for year ended December 31, 2020		$ 106		$ 106
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		$ 2,813
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