RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Narrative (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Balance Sheets
Residential mortgage loan securitized debt obligation, unpaid principal balance			$ 202,911,543
Residential mortgage loans
Balance Sheets
Investment in Multi-Family MBS, carrying value	$ 5,413,720	$ 6,374,821
Multi-family mortgage loans held in securitization trusts, unpaid principal balance	118,884,113	140,690,705
Multi-family securitized debt obligations, unpaid principal balance	$ 118,884,113	$ 140,690,705

Amount of net carrying value or investment of Multi-Family Mortgage Backed Securities (MBS) as of balance sheet date.

No definition available.

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- Definition

Amount of unpaid principal balance of multi-family securitized debt obligations as of balance sheet date.

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No definition available.

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- Definition

Amount of unpaid principal balance of multi-family loans held in securitization trusts as of balance sheet date.

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No definition available.

+ Details

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- Definition

Represents the unpaid principal balance of residential mortgage loans held in the trust and the residential securitized debt obligations issued by the trust.

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No definition available.

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- 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.

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No definition available.

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- Details

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