AVAILABLE-FOR-SALE SECURITIES - AFS Securities by Collateral Type (Details) - USD ($)		Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities	[1]	$ 1,252,375,950	$ 870,929,601
Agency
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities		1,221,868,714	790,190,233
Agency | Federal Home Loan Mortgage Corporation
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities		524,133,540	326,958,046
Agency | Federal National Mortgage Association
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities		697,735,174	463,232,187
Non-Agency
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities		0	7,592,802
Multi-Family
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities		$ 30,507,236	$ 73,146,566

[1] Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of June 30, 2017 and December 31, 2016, assets of consolidated VIEs totaled $1,308,989,628 and $1,369,120,941 respectively, and the liabilities of consolidated VIEs totaled $1,282,788,661 and $1,344,404,080 respectively