Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(a),(b))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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Amount of accretion (amortization) of purchase discount (premium) on nonoperating securities.

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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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AVAILABLE-FOR-SALE SECURITIES - Components of Interest Income on AFS Securities (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Coupon interest	$ 10,169,000	$ 9,719,000	$ 17,551,000	$ 21,516,000	$ 22,720,000	$ 22,627,000	$ 21,595,000	$ 22,191,000	$ 12,152,397	$ 28,046,192
Net (premium amortization)/ discount accretion									(1,403,431)	1,475,701
Interest income									10,748,966	29,521,893
Agency
Debt Securities, Available-for-sale [Line Items]
Coupon interest									12,152,397	28,003,938
Net (premium amortization)/ discount accretion									(1,435,534)	(654,970)
Interest income									10,716,863	27,348,968
Non-Agency
Debt Securities, Available-for-sale [Line Items]
Coupon interest									0	42,254
Net (premium amortization)/ discount accretion									0	9,946
Interest income									0	52,200
Multi-Family
Debt Securities, Available-for-sale [Line Items]
Coupon interest									0	0
Net (premium amortization)/ discount accretion									32,103	2,120,725
Interest income									$ 32,103	$ 2,120,725