MORTGAGE-BACKED SECURITIES - MBS Portfolio (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair Value	$ 211,641,358	$ 212,424,192
Total Pass Through Certificates [Member] \| Fixed Rate Mortgages [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair Value	209,262,000	209,675,000
Total Strucutured MBS Certificates [Member] \| Interest Only Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair Value	1,703,000	2,021,000
Total Strucutured MBS Certificates [Member] \| Inverse Interest Only [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair Value	$ 676,000	$ 728,000

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant