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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Fair Value	$ (190,362)	$ (49,066)
Notional Amount	10,799,279	5,911,385
TBAs
Derivative [Line Items]
Notional Amount	3,620,000	1,460,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(234,011)	(84,855)
Notional Amount	6,148,072	2,953,724
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(166,465)	(36,416)
Notional Amount	3,896,300	1,742,000
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(61,685)	(34,492)
Notional Amount	139,500	139,500
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(4,192)	(13,215)
Notional Amount	1,655,000	935,000
Derivative Liabilities | Loan purchase commitments
Derivative [Line Items]
Fair Value	(1,669)	(732)
Notional Amount	457,272	137,224
Derivative Assets
Derivative [Line Items]
Fair Value	43,649	35,789
Notional Amount	4,651,207	2,957,661
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	28,987	28,211
Notional Amount	1,190,500	2,106,500
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	5,250	4,665
Notional Amount	1,960,000	520,000
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	4,655	0
Notional Amount	625,000	0
Derivative Assets | Loan purchase commitments
Derivative [Line Items]
Fair Value	4,757	2,913
Notional Amount	$ 875,707	$ 331,161

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=118260190&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=109980867&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=109980867&loc=SL5579245-113959

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