Collateral Positions (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Principal/notional balance	$ 23,354,075	$ 20,114,683
Repurchase Agreements	19,122,295	15,047,528
Secured Loans	1,898,489	1,930,364
Interest Rate Swaps, Futures Contracts and Currency Forward Contracts	189,780	159,914
Total collateral pledged	21,326,959	17,151,306
Cash collateral held	170	18,083
Non-cash collateral held	181	0
Total collateral held	351	18,083
Interest Rate Swaps, Futures Contracts and Currency Forward Contracts
Derivative [Line Items]
Interest Rate Swaps, Futures Contracts and Currency Forward Contracts	306,175	173,414
Repurchase Agreements
Derivative [Line Items]
Cash collateral held	10	0
Non-cash collateral held	181	0
Total collateral held	191	0
Interest Rate Swaps
Derivative [Line Items]
Cash collateral held	160	18,083
Total collateral held	160	18,083
Agency RMBS
Derivative [Line Items]
Repurchase Agreements	10,187,555	10,158,404
Secured Loans	621,471	702,952
Agency CMBS
Derivative [Line Items]
Principal/notional balance	4,561,276	973,122
Repurchase Agreements	4,446,384	870,702
Non-Agency CMBS
Derivative [Line Items]
Principal/notional balance	4,464,525	4,024,715
Repurchase Agreements	2,549,841	2,016,202
Secured Loans	1,276,418	1,227,412
Non-Agency RMBS
Derivative [Line Items]
Principal/notional balance	2,340,119	2,800,335
Repurchase Agreements	943,176	1,127,911
GSE CRT
Derivative [Line Items]
Principal/notional balance	858,244	738,529
Repurchase Agreements	918,117	819,328
Mortgage-backed and credit risk transfer securities
Derivative [Line Items]
Principal/notional balance	99,300	131,800
Total collateral pledged	21,132,742	17,082,825
Loan Participation Interest
Derivative [Line Items]
Repurchase Agreements	44,654	54,981
Total collateral pledged	44,654	54,981
Cash
Derivative [Line Items]
Repurchase Agreements	32,568	0
Total collateral pledged	32,568	13,500
Cash \| Interest Rate Swaps, Futures Contracts and Currency Forward Contracts
Derivative [Line Items]
Interest Rate Swaps, Futures Contracts and Currency Forward Contracts	0	13,500
Restricted cash
Derivative [Line Items]
Secured Loans	600	0
Total collateral pledged	116,995	0
Restricted cash \| Interest Rate Swaps, Futures Contracts and Currency Forward Contracts
Derivative [Line Items]
Interest Rate Swaps, Futures Contracts and Currency Forward Contracts	$ 116,395	$ 0

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Derivative Asset, Fair Value of Collateral, Securities

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Fair value of securities received as collateral against derivative assets.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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