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LOANS - Additional Information about Residential Mortgage Loans (Details) - Residential Mortgage $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) point	Dec. 31, 2018 USD ($) point
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 2,686,557	$ 2,425,657
Minimum
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 1	$ 0
Interest rate	2.00%	2.00%
FICO score at loan origination | point	505	505
Loan-to-value ratio at loan origination	8.00%	8.00%
Maximum
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 3,448	$ 3,500
Interest rate	9.25%	7.75%
FICO score at loan origination | point	823	823
Loan-to-value ratio at loan origination	111.00%	111.00%
Weighted Average
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 457	$ 457
Interest rate	4.85%	4.72%
FICO score at loan origination | point	752	752
Loan-to-value ratio at loan origination	68.00%	68.00%

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- Definition

FICO score.

+ References

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X

- Definition

Investment Interest Rate, Percentage

+ References

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X

- Definition

Loan To Value Percentage

+ References

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719

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