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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Fair Value	$ 56,746,000	$ 37,166,000
Notional Amount	12,693,885,000	11,346,407,000
TBAs
Derivative [Line Items]
Notional Amount	5,210,000,000	6,630,000,000
Interest rate futures
Derivative [Line Items]
Notional Amount	195,000,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(73,178,000)	(16,072,000)
Notional Amount	5,132,102,000	3,582,153,000
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	0	0
Notional Amount	4,000,000	0
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(35,621,000)	(15,495,000)
Notional Amount	1,860,000,000	3,105,000,000
Derivative Liabilities | Interest rate futures
Derivative [Line Items]
Fair Value	(2,451,000)	0
Notional Amount	195,000,000	0
Derivative Liabilities | Residential loan purchase commitments, net
Derivative [Line Items]
Fair Value	(35,106,000)	(577,000)
Notional Amount	3,073,102,000	477,153,000
Derivative Assets
Derivative [Line Items]
Fair Value	129,924,000	53,238,000
Notional Amount	7,561,783,000	7,764,254,000
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	4,350,000	224,000
Notional Amount	163,000,000	42,000,000
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	40,800,000	18,260,000
Notional Amount	3,350,000,000	3,520,000,000
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	83,610,000	19,727,000
Notional Amount	3,825,000,000	1,585,000,000
Derivative Assets | Residential loan purchase commitments, net
Derivative [Line Items]
Fair Value	1,164,000	15,027,000
Notional Amount	$ 223,783,000	$ 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=121572278&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=121590274&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=121590274&loc=SL5579245-113959

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