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Valuation Unobservable Input Reconciliation (Details) - Level 3 [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Agency RMBS [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 3,626 | $ 2,525 | $ 2,254 | $ 12,347
Purchases | 0 | 0 | 160 | 2,621
Proceeds from sales | 0 | 0 | 0 | 0
Principal repayments | 0 | 0 | 0 | 0
(Amortization)/accretion, net | (251) | (277) | (884) | (2,469)
Net realized gains (losses) | (11) | (106) | (177) | (180)
Change in net unrealized gains (losses) | 62 | (13) | 536 | (1,369)
Transfers |  |  |  |
Transfers into level 3 | 1,598 | 777 | 2,219 | 0
Transfers out of level 3 | (916) | (500) | 0 | (8,544)
Ending balance | 4,108 | 2,406 | 4,108 | 2,406
Change in net unrealized gains (losses) for level 3 assets still held | 200 | (12) | 700 | (300)
Non-Agency RMBS [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 6,993 | 6,450 | 8,832 | 6,498
Purchases | 0 | 2,508 | 0 | 4,324
Proceeds from sales | 0 | 0 | (3,638) | (2,866)
Principal repayments | (369) | (260) | (593) | (675)
(Amortization)/accretion, net | 62 | 100 | 197 | 236
Net realized gains (losses) | 0 | 4 | 1,254 | 184
Change in net unrealized gains (losses) | 289 | 82 | (660) | 1,009
Transfers |  |  |  |
Transfers into level 3 | 658 | 2,400 | 2,241 | 4,414
Transfers out of level 3 | 0 | 0 | 0 | (1,840)
Ending balance | 7,633 | 11,284 | 7,633 | 11,284
Change in net unrealized gains (losses) for level 3 assets still held | 300 | 300 | 300 | 1,400
Residential Mortgage Backed Securities [Member] |  |  |  |
Transfers |  |  |  |
Transfers into level 3 | 2,300 | 3,200 | $ 4,500 | 4,400
Transfers out of level 3 | $ (900) | $ (500) |  | $ (10,400)

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- Definition Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortized Premiums/Accreted Discounts, Net + References No definition available. + Details
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- Definition Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Principal Repayments + References No definition available. + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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