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Repurchase Agreements (Borrowings Under Repurchase Agreement) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 8,571,422	$ 7,879,087
Repurchase agreement financings are subject to termination	1,700,000
Repurchase Agreement Borrowings
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 8,572,545	$ 7,879,114
Weighted Average Interest Rate	3.22%	3.42%
Less debt issuance costs	$ 1,123	$ 27
Total repurchase agreements less debt issuance costs	8,571,422	7,879,087
Repurchase Agreement Borrowings | Overnight
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 0
Weighted Average Interest Rate	0.00%
Repurchase Agreement Borrowings | Within 30 Days
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 4,082,663
Weighted Average Interest Rate	2.88%
Repurchase Agreement Borrowings | Over 30 Days to 3 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 1,973,985
Weighted Average Interest Rate	3.36%
Repurchase Agreement Borrowings | Over 3 Months to 12 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 1,594,693
Weighted Average Interest Rate	3.59%
Repurchase Agreement Borrowings | Over 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 921,204
Weighted Average Interest Rate	3.77%
Repurchase Agreement Borrowings | Within 30 days
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 6,487,134	$ 6,747,166
Weighted Average Interest Rate	3.18%	3.35%
Repurchase Agreement Borrowings | Over 30 days to 3 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 660,954	$ 368,857
Weighted Average Interest Rate	2.46%	3.10%
Repurchase Agreement Borrowings | Over 3 months to 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 1,312,280	$ 763,091
Weighted Average Interest Rate	3.72%	4.18%
Repurchase Agreement Borrowings | Over 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 112,177	$ 0
Weighted Average Interest Rate	3.87%	0.00%
Agency MBS
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 1,675,861	$ 2,384,357
Agency MBS | Overnight
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Agency MBS | Within 30 Days
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	1,067,633
Agency MBS | Over 30 Days to 3 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	608,228
Agency MBS | Over 3 Months to 12 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Agency MBS | Over 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Legacy Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	1,231,908	1,447,585
Legacy Non-Agency MBS | Overnight
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Legacy Non-Agency MBS | Within 30 Days
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	1,017,253
Legacy Non-Agency MBS | Over 30 Days to 3 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Legacy Non-Agency MBS | Over 3 Months to 12 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	214,655
Legacy Non-Agency MBS | Over 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
RPL/NPL MBS
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	642,740	1,084,532
RPL/NPL MBS | Overnight
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
RPL/NPL MBS | Within 30 Days
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	642,740
RPL/NPL MBS | Over 30 Days to 3 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
RPL/NPL MBS | Over 3 Months to 12 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
RPL/NPL MBS | Over 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
CRT securities
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	303,544	391,586
CRT securities | Overnight
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
CRT securities | Within 30 Days
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	303,544
CRT securities | Over 30 Days to 3 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
CRT securities | Over 3 Months to 12 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
CRT securities | Over 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Residential Whole Loans, at Fair Value
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	3,727,526	2,020,508
Residential Whole Loans, at Fair Value | Overnight
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Residential Whole Loans, at Fair Value | Within 30 Days
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	300,767
Residential Whole Loans, at Fair Value | Over 30 Days to 3 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	1,365,757
Residential Whole Loans, at Fair Value | Over 3 Months to 12 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	1,251,974
Residential Whole Loans, at Fair Value | Over 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	809,028
MSR-related assets
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	918,055	474,127
MSR-related assets | Overnight
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
MSR-related assets | Within 30 Days
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	744,876
MSR-related assets | Over 30 Days to 3 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
MSR-related assets | Over 3 Months to 12 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	128,064
MSR-related assets | Over 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	45,115
Other
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	72,911	$ 76,419
Other | Overnight
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Other | Within 30 Days
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	5,850
Other | Over 30 Days to 3 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Other | Over 3 Months to 12 Months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	0
Other | Over 12 months
Debt Securities, Available-for-sale [Line Items]
Balance of repurchase agreements	$ 67,061
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

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- Definition

Securities Sold Under Agreements To Repurchase, Net of Debt Issuance Costs

+ References

No definition available.

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Securities Sold Under Agreements To Repurchase, Subject To Termination

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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.

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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.

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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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