INVESTMENTS (Mortgage Loans) (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Mortgage loans, held for investment:
Commercial	$ 656,056,000	$ 593,290,000
Commercial, Percent	100.00%	100.00%
Total mortgage loans, held-for-investment	$ 656,056,000	$ 593,290,000
Total mortgage loans, held-for investment, Percent	100.00%	100.00%
Weighted average debt service coverage ratios	2.5	2.4
Weighted average loan-to-value ratios	60.00%	60.00%
Credit losses associated with commercial mortgage loans	$ 0	$ 0