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Financing Agreements (Pledged Collateral) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 7,024,171 | $ 5,842,560
Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 1,369,924 | 1,927,464
Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 3,287,985 | 2,046,954
Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 2,366,262 | 1,868,142
Residential whole loans, at carrying value |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 3,007,602 | 4,140,961
Residential whole loans, at carrying value | Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 794,267 | 1,497,281
Residential whole loans, at carrying value | Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 533,633 | 1,207,364
Residential whole loans, at carrying value | Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 1,679,702 | 1,436,316
Residential whole loans, at fair value |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 3,705,529 | 1,209,349
Residential whole loans, at fair value | Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 555,738 | 430,183
Residential whole loans, at fair value | Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 2,499,284 | 396,817
Residential whole loans, at fair value | Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 650,507 | 382,349
Securities, at fair value |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 222,705 | 442,773
Securities, at fair value | Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 0 | 0
Securities, at fair value | Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 222,705 | 442,773
Securities, at fair value | Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 0 | 0
Other assets: REO |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 88,335 | 49,477
Other assets: REO | Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 19,919 | 0
Other assets: REO | Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 32,363 | 0
Other assets: REO | Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 36,053 | $ 49,477

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- Definition The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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