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INVESTMENTS (Mortgage Loans) (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Mortgage Loans held-for-investment:    
Commercial $ 544,095,000 $ 432,748,000
Commercial, Percent 100.00% 100.00%
Total Mortgage Loans held-for-investment $ 544,095,000 $ 432,748,000
Total Mortgage Loans held-for investment, Percent 100.00% 100.00%
Weighted average debt service coverage ratios 2.1  
Weighted average loan-to-value ratios 59.00%  
Credit losses associated with commercial mortgage loans $ 0 $ 0