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Financing Agreements (Pledged Collateral) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	$ 5,414,137	$ 5,522,396
Non-Mark-to-Market
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	1,348,347	1,927,464
Mark-to-Market
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	1,734,440	1,726,790
Securitized
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	2,331,350	1,868,142
Residential whole loans, at carrying value
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	3,408,057	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	916,778	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	682,947	1,207,364
Residential whole loans, at carrying value | Securitized
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	1,808,332	1,436,316
Residential whole loans, at fair value
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	1,915,082	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	413,804	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	1,016,692	396,817
Residential whole loans, at fair value | Securitized
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	484,586	382,349
Securities, at fair value
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	0	122,609
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	0	122,609
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	90,998	49,477
Other assets: REO | Non-Mark-to-Market
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	17,765	0
Other assets: REO | Mark-to-Market
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	34,801	0
Other assets: REO | Securitized
Debt Instrument [Line Items]
Fair value of securities pledged as collateral under financing agreements	$ 38,432	$ 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

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