MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses at beginning of period	$ 2,500,000	$ 1,900,000	$ 1,451,167
Provision for loan losses	600,000	600,000	448,833
Charge-offs	0	0	0
Provision for loan losses at end of period	$ 3,100,000	$ 2,500,000	$ 1,900,000