INCOME TAXES - Deferred Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of the income tax computed at federal statutory rates to the income tax provision reported
Income from continuing operations before income taxes for TRSs	$ 381,134,000	$ 32,358,000	$ 6,918,000
Income tax provision	1,376,000	1,646,000	806,000
Deferred tax liabilities:
Reserve for uncertain tax positions	0	0
TRS
Reconciliation of the income tax computed at federal statutory rates to the income tax provision reported
Income from continuing operations before income taxes for TRSs	4,878,000	5,684,000	3,010,000
Expected federal income tax provision	1,658,000	1,933,000	1,023,000
State income taxes	27,000	21,000	42,000
Change in valuation allowance	(37,000)	(1,443,000)	(302,000)
Other	(272,000)	1,135,000	43,000
Income tax provision	1,376,000	1,646,000	$ 806,000
Deferred tax assets:
Net operating losses	39,000	59,000
Secured borrowings—government guaranteed loans	308,000	706,000
Other	111,000	104,000
Total gross deferred tax assets	458,000	869,000
Valuation allowance	(26,000)	(64,000)
Deferred tax asset, net of valuation allowance	432,000	805,000
Deferred tax liabilities:
Loans receivable	(333,000)	(535,000)
Other	0	(10,000)
Deferred tax liabilities	(333,000)	(545,000)
Deferred tax asset, net	$ 99,000	$ 260,000