INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Narrative (Details) - MSRs	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Discount rate	7.80%	8.70%
Excess MSRs Investees
Investment [Line Items]
Discount rate	7.80%	8.80%

Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746

Name:	us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration