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RESERVE FOR LOSS ON REPURCHASED LOANS - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Representations and Warranties Obligations and Corporate Guarantees
Loss Contingencies [Line Items]
Increase (decrease) in reserve for loss on repurchased loans	$ 3.7
Freddie Mac Multifamily Loan Securitization Reserve
Loss Contingencies [Line Items]
Increase (decrease) in reserve for loss on repurchased loans	$ 4.4
Representations and Warranties Obligations and Corporate Guarantees, Portfolio Run-Off And Repurchase Settlement Activities
Loss Contingencies [Line Items]
Increase (decrease) in reserve for loss on repurchased loans		$ (1.5)

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Amount of increase (decrease) in loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

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