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INVESTMENTS - Mortgage loans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Mortgage Loans held-for-investment:
Commercial	$ 432,748,000	$ 298,650,000
Total Mortgage Loans held-for-investment	$ 432,748,000	$ 298,650,000
% of Total
Commercial	100.00%	100.00%
Total Mortgage Loans held-for-investment	100.00%	100.00%
Debt service coverage ratio, in excess of	2.1
Loan-to-value ratio, percent (less than)	57.00%
Credit losses on commercial mortgage loans	$ 0	$ 0

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Loans Held For Investment, Commercial, Percent

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Loans Held For Investment, Percent [Abstract]

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Total Mortgage Loans held-for-investment, Percent

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Weighted Average Debt Service Coverage Ratios

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Weighted average loan-to-value ratios

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
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Amount, before allowance for credit loss, of financing receivable.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

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