SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Traditional Life, Health, and Credit Insurance Products (Details)	Dec. 31, 2017
Minimum
Liability for unpaid claims and claims adjustment expense
Reserve investment yield assumptions	1.00%
Minimum \| Traditional Life Insurance
Liability for unpaid claims and claims adjustment expense
Reserve investment yield assumptions	2.75%
Maximum
Liability for unpaid claims and claims adjustment expense
Reserve investment yield assumptions	7.80%
Maximum \| Traditional Life Insurance
Liability for unpaid claims and claims adjustment expense
Reserve investment yield assumptions	4.50%

Rate of interest used to calculate the liability for future policy benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.13(b))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439

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