Borrowings - Schedule of Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Secured Debt, Excluding Asset-backed Securities
Total Borrowings
Amount Outstanding	$ 6,987,834	$ 7,228,699
Weighted Average Interest Rate	0.14%	0.21%
Weighted Average Remaining Maturity (days)	29 days	14 days
Agency RMBS
Repurchase Agreements - Agency RMBS
Amount Outstanding	$ 6,987,834	$ 7,228,699
Weighted Average Interest Rate	0.14%	0.21%
Weighted Average Remaining Maturity (days)	29 days	14 days

Secured Debt Weighted Average Interest Rate

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- Definition

Secured Debt Weighted Average Remaining Maturity

+ References

No definition available.

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- Definition

Securities sold under agreements to repurchase, weighted average interest rate.

+ References

No definition available.

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- Definition

Securities Sold under Agreements to Repurchase Weighted Average Remaining Maturity.

+ References

No definition available.

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- References

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- References

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729

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