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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Financial Instruments Not Recorded at Fair Value (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
mortgage_loan
Sep. 30, 2019
USD ($)
Carrying Amount    
Liabilities:    
Mortgages payable $ 386,923 $ 96,919
Junior subordinated notes 25,215 25,278
Carrying Amount | SBA 7(a) loans receivable, subject to loan-backed notes    
Assets:    
Loans receivable 37,031 31,404
Carrying Amount | SBA 7(a) loans receivable, subject to credit risk    
Assets:    
Loans receivable 29,748 26,257
Carrying Amount | SBA 7(a) loans receivable, subject to secured borrowings    
Assets:    
Loans receivable 16,469 13,915
Fair Value, Measurements, Nonrecurring | Estimated Fair Value | Level 3    
Liabilities:    
Mortgages payable 377,364 101,258
Junior subordinated notes 24,462 24,410
Fair Value, Measurements, Nonrecurring | Estimated Fair Value | Level 3 | SBA 7(a) loans receivable, subject to loan-backed notes    
Assets:    
Loans receivable 38,357 32,658
Fair Value, Measurements, Nonrecurring | Estimated Fair Value | Level 3 | SBA 7(a) loans receivable, subject to credit risk    
Assets:    
Loans receivable 30,630 27,310
Fair Value, Measurements, Nonrecurring | Estimated Fair Value | Level 3 | SBA 7(a) loans receivable, subject to secured borrowings    
Assets:    
Loans receivable $ 16,706 $ 14,015
Disposal Group, Held-for-sale, Not Discontinued Operations    
Carrying Value    
Number of mortgage loans excluded | mortgage_loan 1  
Debt classified as liabilities associated with assets held for sale $ 28,018