OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Rents and interest and other income	$ 28,621	$ 27,539	$ 23,756	$ 22,304	$ 20,578	$ 18,466	$ 18,511	$ 18,303	$ 22,095	$ 18,663	$ 18,351	$ 18,242	$ 102,220	$ 75,858	$ 77,351
Property operating expenses													(52,257)	(39,484)	(36,669)
Depreciation													(21,299)	(17,398)	(15,842)
Loan charges and prepayment penalties													(4,955)	(2,804)	(5,219)
Gain on land sales	13,788	997	1,250	2,876	(73)	40	(159)	753	(1,025)			(48)	18,911	561	(1,073)
Segment operating income (loss)	(1,111)	$ 2,926	$ 4,446	$ 3,040	(1,481)	$ 1,202	$ 123	$ 927	(10,403)	$ 1,191	$ 2,015	$ 1,826	9,301	771	(5,371)
Total real estate	844,019				689,121								844,019	689,121
Property Sales
Cost of sale													(38,785)	(95,027)	(233,617)
Gain (loss) on sale													735	61,879	97,405
Commercial Properties [Member]
Segment Reporting Information [Line Items]
Rents and interest and other income													29,308	19,129	22,928
Property operating expenses													(16,838)	(12,238)	(10,857)
Depreciation													(8,861)	(7,310)	(5,846)
Mortgage and loan interest													(6,891)	(5,699)	(5,568)
Loan charges and prepayment penalties														(113)	(150)
Segment operating income (loss)													(3,282)	(6,231)	507
Capital expenditures													8,118	4,418	6,964
Total real estate	153,270				140,131				129,063				153,270	140,131	129,063
Property Sales
Sales price														19,182	26,974
Cost of sale														(9,168)	(14,914)
Gain (loss) on sale														10,014	12,060
Apartments [Member]
Segment Reporting Information [Line Items]
Rents and interest and other income													72,809	56,685	54,272
Property operating expenses													(34,437)	(26,065)	(24,798)
Depreciation													(12,438)	(10,088)	(9,996)
Mortgage and loan interest													(18,584)	(16,321)	(18,013)
Loan charges and prepayment penalties													(4,922)	(2,625)	(3,937)
Segment operating income (loss)													2,428	1,586	(2,472)
Capital expenditures													1,780	320	315
Total real estate	553,860				391,767				354,035				553,860	391,767	354,035
Property Sales
Sales price													11,129	115,273	239,676
Cost of sale													(10,394)	(63,408)	(154,331)
Gain (loss) on sale													735	51,865	85,345
Land [Member]
Segment Reporting Information [Line Items]
Rents and interest and other income														1	39
Property operating expenses													(712)	(1,169)	(976)
Mortgage and loan interest													(4,214)	(4,318)	(5,880)
Loan charges and prepayment penalties														(16)	(1,080)
Gain on land sales													18,911	561	(1,073)
Segment operating income (loss)													13,985	(4,941)	(8,970)
Capital expenditures													2,621	2,435	387
Total real estate	136,889				157,223				158,359				136,889	157,223	158,359
Property Sales
Sales price													102,898	8,091	5,999
Cost of sale													(83,987)	(7,530)	(7,072)
Gain (loss) on sale													18,911	561	(1,073)
Other [Member]
Segment Reporting Information [Line Items]
Rents and interest and other income													103	43	112
Property operating expenses													(270)	(12)	(38)
Mortgage and loan interest													(11,897)	(4,539)	(2,815)
Loan charges and prepayment penalties													(33)	(50)	(52)
Interest income													10,687	$ 12,194	13,790
Gain on land sales
Segment operating income (loss)													(1,410)	$ 7,636	10,997
Total Segments [Member]
Segment Reporting Information [Line Items]
Rents and interest and other income													102,220	75,858	77,351
Property operating expenses													(52,257)	(39,484)	(36,669)
Depreciation													(21,299)	(17,398)	(15,842)
Mortgage and loan interest													(41,586)	(30,877)	(32,276)
Loan charges and prepayment penalties													(4,955)	(2,804)	(5,219)
Interest income													10,687	12,194	13,790
Gain on land sales													18,911	561	(1,073)
Segment operating income (loss)													11,721	(1,950)	62
Capital expenditures													12,519	7,173	7,666
Total real estate	$ 844,019				$ 689,121				$ 641,457				844,019	689,121	641,457
Property Sales
Sales price													114,027	142,546	272,649
Cost of sale													(94,381)	(80,106)	(176,317)
Gain (loss) on sale													$ 19,646	$ 62,440	$ 96,332