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Repurchase Agreements (Maturity Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 9,139,821	$ 7,879,087
Repurchase agreement financings are subject to termination	2,400,000
Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	1,557,675	2,384,357
Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	1,121,802	1,447,585
RPL/NPL MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	495,091	1,084,532
CRT securities
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	203,569	391,586
Residential whole loans, at fair value
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	4,743,094	2,020,508
Term Notes Backed by MSR-Related Collateral
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	962,515	474,127
Other
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	57,198	76,419
Repurchase agreements
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 9,140,944	$ 7,879,114
Weighted Average Interest Rate	2.99%	3.42%
Unamortized debt issuance expense	$ 1,123	$ 27
Overnight | Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Overnight | Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Overnight | RPL/NPL MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Overnight | CRT securities
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Overnight | Residential whole loans, at fair value
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Overnight | Term Notes Backed by MSR-Related Collateral
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Overnight | Other
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Overnight | Repurchase agreements
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 0
Weighted Average Interest Rate	0.00%
Within 30 Days | Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 1,557,675
Within 30 Days | Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	942,212
Within 30 Days | RPL/NPL MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	495,091
Within 30 Days | CRT securities
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	203,569
Within 30 Days | Residential whole loans, at fair value
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	486,226
Within 30 Days | Term Notes Backed by MSR-Related Collateral
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	772,197
Within 30 Days | Other
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	15,150
Within 30 Days | Repurchase agreements
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 4,472,120
Weighted Average Interest Rate	2.55%
Over 30 Days to 3 Months | Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 0
Over 30 Days to 3 Months | Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 30 Days to 3 Months | RPL/NPL MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 30 Days to 3 Months | CRT securities
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 30 Days to 3 Months | Residential whole loans, at fair value
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	2,600,720
Over 30 Days to 3 Months | Term Notes Backed by MSR-Related Collateral
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	145,664
Over 30 Days to 3 Months | Other
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 30 Days to 3 Months | Repurchase agreements
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 2,746,384
Weighted Average Interest Rate	3.43%
Over 3 Months to 12 Months | Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 0
Over 3 Months to 12 Months | Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	179,590
Over 3 Months to 12 Months | RPL/NPL MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 3 Months to 12 Months | CRT securities
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 3 Months to 12 Months | Residential whole loans, at fair value
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	748,149
Over 3 Months to 12 Months | Term Notes Backed by MSR-Related Collateral
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	44,654
Over 3 Months to 12 Months | Other
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	42,048
Over 3 Months to 12 Months | Repurchase agreements
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 1,014,441
Weighted Average Interest Rate	3.36%
Over 12 months | Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 0
Over 12 months | Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 12 months | RPL/NPL MBS
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 12 months | CRT securities
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 12 months | Residential whole loans, at fair value
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	907,999
Over 12 months | Term Notes Backed by MSR-Related Collateral
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 12 months | Other
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	0
Over 12 months | Repurchase agreements
Debt Securities, Available-for-sale [Line Items]
Repurchase agreements	$ 907,999
Weighted Average Interest Rate	3.44%
Minimum
Debt Securities, Available-for-sale [Line Items]
Repurchase agreement financings are subject to termination, period	1 month
Maximum
Debt Securities, Available-for-sale [Line Items]
Repurchase agreement financings are subject to termination, period	6 months

X

- Definition

Securities Sold Under Agreements To Repurchase, Subject To Termination

+ References

No definition available.

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- Definition

Securities Sold Under Agreements To Repurchase, Subject To Termination, Notice Period

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- Definition

Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii))
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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