COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Loss Contingencies [Line Items]
Estimated liability, representation and warranties	$ 9.8
Residential mortgage loan repurchase liability	1,500.0
Rent expense, net of sublease income	3.4	$ 3.4
Sublease rentals	0.9
Unfunded Loan Commitment \| Consumer Portfolio Segment \| Consumer Loan SPVs
Loss Contingencies [Line Items]
Financing receivable	$ 256.8

Estimated Liability, Representation and Warranties

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- Definition

Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income

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- Definition

Residential Mortgage Loan Repurchase Liability

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- Definition

Amount of lease payments to be received by lessor for operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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