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Mortgage-Backed Securities Interest Income Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Interest Income Components [Line Items] |  |  |  |  |
Net Amortization |  |  | $ (8,165) | $ (6,025) | [1]
Interest income | $ 13,171 | $ 12,867 | 40,677 | 36,078 |
Agency RMBS [Member] |  |  |  |  |
Interest Income Components [Line Items] |  |  |  |  |
Coupon Interest | 16,744 | 16,880 | 50,341 | 43,373 |
Net Amortization | (4,029) | (4,646) | (11,485) | (8,983) |
Interest income | 12,715 | 12,234 | 38,856 | 34,390 |
Non-Agency RMBS [Member] |  |  |  |  |
Interest Income Components [Line Items] |  |  |  |  |
Coupon Interest | 362 | 186 | 680 | 593 |
Net Amortization | 44 | 172 | 282 | 445 |
Interest income | 406 | 358 | 962 | 1,038 |
Residential Mortgage Backed Securities [Member] |  |  |  |  |
Interest Income Components [Line Items] |  |  |  |  |
Coupon Interest | 17,106 | 17,066 | 51,021 | 43,966 |
Net Amortization | (3,985) | (4,474) | (11,203) | (8,538) |
Interest income | $ 13,121 | $ 12,592 | $ 39,818 | $ 35,428 |
[1] | Conformed to current period presentation.

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- Definition [Line Items] for Interest Income Components [Table] + References No definition available. + Details
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- Definition 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=109223946&loc=d3e3602-108585 + Details
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- Definition Amount of the required periodic payments applied to interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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