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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair Value	$ 44,495	$ (47,363)
Notional Amount	6,645,489	6,644,081
TBAs
Derivative [Line Items]
Notional Amount	1,980,000	1,700,000
Futures
Derivative [Line Items]
Notional Amount	15,000	8,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(42,724)	(63,081)
Notional Amount	1,656,136	3,485,466
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(11,785)	(11,888)
Notional Amount	565,500	1,248,000
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(26,796)	(43,679)
Notional Amount	139,500	139,500
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(1,744)	(3,808)
Notional Amount	500,000	1,400,000
Derivative Liabilities | Loan purchase commitments
Derivative [Line Items]
Fair Value	(2,399)	(3,706)
Notional Amount	451,136	697,966
Derivative Assets
Derivative [Line Items]
Fair Value	87,219	15,718
Notional Amount	4,989,353	3,158,615
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	78,006	10,122
Notional Amount	3,139,000	1,765,000
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	6,987	133
Notional Amount	1,480,000	295,000
Derivative Assets | Futures
Derivative [Line Items]
Fair Value	44	1
Notional Amount	15,000	7,500
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	0	42
Notional Amount	0	200,000
Derivative Assets | Loan purchase commitments
Derivative [Line Items]
Fair Value	2,182	3,243
Notional Amount	355,353	547,434
Derivative Assets | Loan forward sale commitments
Derivative [Line Items]
Fair Value	0	2,177
Notional Amount	$ 0	$ 343,681

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

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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

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+ References

No definition available.

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