Mortgage-Backed Securities - Fair Value of Available-for-sale Securities and Securities Accounted for under Fair Value Option by Asset Type (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Percentage of MBS and GSE CRT are accounted for under the fair value option	99.00%	99.00%
Available-for-sale Securities	$ 49,919	$ 70,197
Securities under Fair Value Option	3,865,246	7,734,062
Total Fair Value	3,915,165	7,804,259
30 year fixed-rate
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	0	0
Securities under Fair Value Option	3,802,451	7,701,523
Total Fair Value	3,802,451	7,701,523
Total Agency RMBS pass-through
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	0	0
Securities under Fair Value Option	3,802,451	7,701,523
Total Fair Value	3,802,451	7,701,523
Agency-CMO
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	0	0
Securities under Fair Value Option	60,808	30,757
Total Fair Value	60,808	30,757
Non-Agency CMBS
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	43,644	62,909
Securities under Fair Value Option	0	0
Total Fair Value	43,644	62,909
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	6,275	7,288
Securities under Fair Value Option	1,987	1,782
Total Fair Value	$ 8,262	$ 9,070

Fair Value, Option, Percentage of Mortgage Backed Securities and GSE Credit Risk Transfer Securities, Fair Value

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of investment in marketable security.

+ References

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+ References

No definition available.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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-Publisher FASB
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