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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Fair Value	$ (88,659)	$ (49,066)
Notional Amount	7,052,359	5,911,385
TBAs
Derivative [Line Items]
Notional Amount	2,180,000	1,460,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(110,942)	(84,855)
Notional Amount	3,881,623	2,953,724
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(60,265)	(36,416)
Notional Amount	2,296,000	1,742,000
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(40,296)	(34,492)
Notional Amount	139,500	139,500
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(9,609)	(13,215)
Notional Amount	1,265,000	935,000
Derivative Liabilities | Loan purchase commitments
Derivative [Line Items]
Fair Value	(772)	(732)
Notional Amount	181,123	137,224
Derivative Assets
Derivative [Line Items]
Fair Value	22,283	35,789
Notional Amount	3,170,736	2,957,661
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	11,490	28,211
Notional Amount	1,674,000	2,106,500
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	5,826	4,665
Notional Amount	910,000	520,000
Derivative Assets | Loan purchase commitments
Derivative [Line Items]
Fair Value	4,967	2,913
Notional Amount	$ 586,736	$ 331,161

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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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=109250915&loc=d3e13433-108611

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- 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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