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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Fair Value	$ 40,131,000	$ 37,166,000
Notional Amount	8,968,793,000	11,346,407,000
TBAs
Derivative [Line Items]
Notional Amount	4,400,000,000	6,630,000,000
Interest rate futures
Derivative [Line Items]
Notional Amount	133,000,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(10,972,000)	(16,072,000)
Notional Amount	3,448,279,000	3,582,153,000
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(74,000)	0
Notional Amount	40,500,000	0
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(7,599,000)	(15,495,000)
Notional Amount	2,190,000,000	3,105,000,000
Derivative Liabilities | Interest rate futures
Derivative [Line Items]
Fair Value	(749,000)	0
Notional Amount	133,200,000	0
Derivative Liabilities | Residential loan purchase commitments, net
Derivative [Line Items]
Fair Value	(2,550,000)	(577,000)
Notional Amount	1,084,579,000	477,153,000
Derivative Assets
Derivative [Line Items]
Fair Value	51,103,000	53,238,000
Notional Amount	5,520,514,000	7,764,254,000
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	3,213,000	224,000
Notional Amount	293,200,000	42,000,000
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	8,213,000	18,260,000
Notional Amount	2,205,000,000	3,520,000,000
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	30,415,000	19,727,000
Notional Amount	1,335,000,000	1,585,000,000
Derivative Assets | Residential loan purchase commitments, net
Derivative [Line Items]
Fair Value	9,262,000	15,027,000
Notional Amount	$ 1,687,314,000	$ 2,617,254,000

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 http://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 http://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 http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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