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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Fair Value	$ 58,431	$ 23,150
Notional Amount	2,116,501	6,861,921
TBAs
Derivative [Line Items]
Notional Amount	820,000	3,310,000
Interest rate futures
Derivative [Line Items]
Notional Amount	682,000	72,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(6,782)	(3,317)
Notional Amount	323,844	1,619,790
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(23)	(1,251)
Notional Amount	10,000	283,100
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(6,545)	(658)
Notional Amount	255,000	870,000
Derivative Liabilities | Interest rate futures
Derivative [Line Items]
Fair Value	(2)	(905)
Notional Amount	300	62,500
Derivative Liabilities | Residential loan purchase commitments, net
Derivative [Line Items]
Fair Value	(212)	(503)
Notional Amount	58,544	404,190
Derivative Assets
Derivative [Line Items]
Fair Value	65,213	26,467
Notional Amount	1,792,657	5,242,131
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	24,626	611
Notional Amount	459,000	161,500
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	13,568	2,880
Notional Amount	565,000	2,440,000
Derivative Assets | Interest rate futures
Derivative [Line Items]
Fair Value	26,275	25
Notional Amount	681,500	9,000
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	0	18,318
Notional Amount	0	1,660,000
Derivative Assets | Residential loan purchase commitments, net
Derivative [Line Items]
Fair Value	744	4,633
Notional Amount	$ 87,157	$ 971,631

X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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X

- Definition

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.

+ References

No definition available.

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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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