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MORTGAGE-BACKED SECURITIES - MBS Portfolio (Details) - USD ($)
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair Value $ 73,144,529 $ 52,800,000 $ 54,400,000 $ 217,840,953
Fixed Rate Mortgages [Member]        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair Value 72,782,000     216,231,000
Interest Only Securities [Member]        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair Value 334,000     1,024,000
Inverse Interest Only [Member]        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fair Value $ 29,000     $ 586,000