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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Fair Value	$ 31,065,000	$ 37,166,000
Notional Amount	6,499,482,000	11,346,407,000
TBAs
Derivative [Line Items]
Notional Amount	1,460,000,000	6,630,000,000
Interest rate futures
Derivative [Line Items]
Notional Amount	222,000,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(3,240,000)	(16,072,000)
Notional Amount	1,122,471,000	3,582,153,000
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(957,000)	0
Notional Amount	87,500,000	0
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(1,367,000)	(15,495,000)
Notional Amount	730,000,000	3,105,000,000
Derivative Liabilities | Interest rate futures
Derivative [Line Items]
Fair Value	(194,000)	0
Notional Amount	140,000,000	0
Derivative Liabilities | Residential loan purchase commitments, net
Derivative [Line Items]
Fair Value	(722,000)	(577,000)
Notional Amount	164,971,000	477,153,000
Derivative Assets
Derivative [Line Items]
Fair Value	34,305,000	53,238,000
Notional Amount	5,377,011,000	7,764,254,000
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	264,000	224,000
Notional Amount	133,000,000	42,000,000
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	2,064,000	18,260,000
Notional Amount	730,000,000	3,520,000,000
Derivative Assets | Interest rate futures
Derivative [Line Items]
Fair Value	304,000	0
Notional Amount	81,500,000	0
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	17,482,000	19,727,000
Notional Amount	2,100,000,000	1,585,000,000
Derivative Assets | Residential loan purchase commitments, net
Derivative [Line Items]
Fair Value	14,191,000	15,027,000
Notional Amount	$ 2,332,511,000	$ 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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- 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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