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RESERVE FOR LOSSES AND LOSS EXPENSES - Narrative (Details)	12 Months Ended
	Dec. 31, 2019	Aug. 05, 2019	Mar. 20, 2017	Mar. 19, 2017
Minimum
Claims Development [Line Items]
Development for an accident year or underwriting year, recognition period	1 year
Maximum
Claims Development [Line Items]
Development for an accident year or underwriting year, recognition period	3 years
Motor Reserve Class | Reinsurance
Claims Development [Line Items]
Discount rate		0.25%	0.75%	(2.50%)

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Development For an Accident Year or Underwriting Year, Recognition Period

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- Definition

Discount rate used to obtain present value of liability for unpaid claim and claim adjustment expense for short-duration contract issued by insurance entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116884468&loc=d3e14881-158438

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