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Derivatives Offsetting Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | $ (974) | $ (1,218) |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | (974) | (1,218) |
Derivative, Collateral, Right to Reclaim Securities | [1] | 380 | 0 |
Derivative, Collateral, Right to Reclaim Cash |  | 0 | 1,218 | [1]
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | (594) | 0 |
U.S. Treasury futures |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  | (1,218) |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  | (1,218) |
Derivative, Collateral, Right to Reclaim Securities | [1] |  | 0 |
Derivative, Collateral, Right to Reclaim Cash | [1] |  | 1,218 |
Derivative Liability, Fair Value, Amount Offset Against Collateral |  |  | $ 0 |
Short position | TBA securities |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | (974) |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | (974) |  |
Derivative, Collateral, Right to Reclaim Securities | [1] | 380 |  |
Derivative, Collateral, Right to Reclaim Cash |  | 0 |  |
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | $ (594) |  |
[1] | Amounts disclosed for collateral received by or posted to the same counterparty include cash and the fair value of MBS up to and not exceeding the net amount of the derivative asset or liability presented in the balance sheet. The fair value of the total collateral received by or posted to the same counterparty may exceed the amounts presented. Please refer to the consolidated balance sheets for the total cash posted as collateral, which is recorded as "restricted cash", and the total fair value of financial instruments pledged as collateral for derivatives and repurchase agreements, which is shown parenthetically.

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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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