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Valuation Unobservable Input Reconciliation (Details) - Level 3 [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Agency RMBS [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 7,639 | $ 2,832
Purchases | 77 | 0
Proceeds from sales | 0 | 0
Principal repayments | 0 | 0
(Amortization)/accretion, net | (587) | (250)
Net realized gains (losses) | (1) | (663)
Change in net unrealized gains (losses) | (461) | 535
Transfers |  |
Transfers into level 3 | 1,643 | 862
Transfers out of level 3 | (1,344) | 0
Ending balance | 6,966 | 3,316
Change in net unrealized gains (losses) for level 3 assets still held | (1,200) | 400
Non-Agency RMBS [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 3,273 | 4,634
Purchases | 0 | 0
Proceeds from sales | 0 | 0
Principal repayments | (93) | 453
(Amortization)/accretion, net | 91 | 85
Net realized gains (losses) | 0 | 0
Change in net unrealized gains (losses) | (270) | 344
Transfers |  |
Transfers into level 3 | 0 | 0
Transfers out of level 3 | 0 | 0
Ending balance | 3,001 | 4,610
Change in net unrealized gains (losses) for level 3 assets still held | (300) | 300
Residential Mortgage Backed Securities [Member] |  |
Transfers |  |
Transfers into level 3 | 1,600 | $ 900
Transfers out of level 3 | $ (1,300) |

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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 gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&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 income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&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=117815213&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=117815213&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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