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Financing Agreements - Pledged Collateral (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | $ 8,019,405 | $ 5,799,786
Accrued interest on assets | 25,700 | 24,600
Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 1,426,051 | 1,927,464
Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 3,556,273 | 2,004,180
Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 3,037,081 | 1,868,142
Residential whole loans, at carrying value |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 2,629,919 | 4,140,961
Residential whole loans, at carrying value | Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 693,982 | 1,497,281
Residential whole loans, at carrying value | Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 459,349 | 1,207,364
Residential whole loans, at carrying value | Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 1,476,588 | 1,436,316
Residential whole loans, at fair value |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 5,042,356 | 1,209,349
Residential whole loans, at fair value | Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 706,377 | 430,183
Residential whole loans, at fair value | Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 2,810,865 | 396,817
Residential whole loans, at fair value | Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 1,525,114 | 382,349
Securities, at fair value |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 256,685 | 399,999
Securities, at fair value | Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 0 | 0
Securities, at fair value | Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 256,685 | 399,999
Securities, at fair value | Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 0 | 0
Other assets: REO |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 90,445 | 49,477
Other assets: REO | Non-Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 25,692 | 0
Other assets: REO | Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | 29,374 | 0
Other assets: REO | Securitized |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged against the repurchase agreements | $ 35,379 | $ 49,477

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- Definition Sum of the fair values as of the date of the latest financial statement presented of securities pledged as collateral and the amount of interest receivable on the securities pledged as collateral. + References No definition available. + Details
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- Definition Fair value of securities pledged as collateral against securities sold under agreement to repurchase. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313 + Details
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