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Mortgage-Backed Securities Interest Income Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest Income Components [Line Items]
Net Amortization	$ (3,501)	$ (3,065)
Interest income	9,881	12,613
Agency RMBS [Member]
Interest Income Components [Line Items]
Coupon Interest	14,179	16,269
Net Amortization	(4,843)	(4,146)
Interest income	9,336	12,123
Non-Agency RMBS [Member]
Interest Income Components [Line Items]
Coupon Interest	89	112
Net Amortization	107	132
Interest income	196	244
Residential Mortgage Backed Securities [Member]
Interest Income Components [Line Items]
Coupon Interest	14,268	16,381
Net Amortization	(4,736)	(4,014)
Interest income	$ 9,532	$ 12,367

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- Definition

[Line Items] for Interest Income Components [Table]

+ References

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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- Definition

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

+ References

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 210.5-03.1(e))
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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