FAIR VALUE OF FINANCIAL INSTRUMENTS (Commercial Mortgage Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 47,690	$ 42,520
Valuation allowance	(76)	(72)
Mortgage loans, net	$ 47,614	$ 42,448
Percent of Total	100.00%	100.00%
Multifamily
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 17,038	$ 11,741
Percent of Total	35.70%	27.60%
Office
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 11,861	$ 11,848
Percent of Total	24.90%	27.90%
Industrials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 10,124	$ 10,124
Percent of Total	21.20%	23.80%
Retail
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 2,227	$ 2,227
Percent of Total	4.70%	5.20%
Mixed use/Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 6,440	$ 6,580
Percent of Total	13.50%	15.50%
East North Central
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 3,245	$ 3,245
Percent of Total	6.80%	7.60%
Southern Atlantic
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 9,752	$ 7,026
Percent of Total	20.50%	16.50%
East South Central
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 8,197	$ 8,358
Percent of Total	17.20%	19.70%
New England
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 6,588	$ 6,588
Percent of Total	13.80%	15.50%
Middle Atlantic
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 14,936	$ 15,076
Percent of Total	31.20%	35.50%
Mountain
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 2,227	$ 2,227
Percent of Total	4.70%	5.20%
Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 2,745	$ 0
Percent of Total	5.80%	0.00%
Less than 65%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 30,361	$ 34,024
65%-75%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 17,329	$ 8,496