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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Fair Value	$ (53,290)	$ (29,734)
Notional Amount	6,244,759	4,980,343
TBAs
Derivative [Line Items]
Notional Amount	1,940,000	1,360,000
Futures
Derivative [Line Items]
Notional Amount	37,000	88,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(65,238)	(66,329)
Notional Amount	3,640,709	2,423,362
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(12,901)	(12,097)
Notional Amount	1,838,500	1,101,500
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(45,093)	(44,822)
Notional Amount	139,500	139,500
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(3,946)	(4,681)
Notional Amount	950,000	510,000
Derivative Liabilities | Futures
Derivative [Line Items]
Fair Value	(423)	(928)
Notional Amount	29,000	87,500
Derivative Liabilities | Loan purchase commitments
Derivative [Line Items]
Fair Value	(2,875)	(3,801)
Notional Amount	683,709	584,862
Derivative Assets
Derivative [Line Items]
Fair Value	11,948	36,595
Notional Amount	2,604,050	2,556,981
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	3,645	19,859
Notional Amount	509,000	1,009,000
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	2,875	8,300
Notional Amount	985,000	850,000
Derivative Assets | Futures
Derivative [Line Items]
Fair Value	135	0
Notional Amount	7,500	0
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	297	5,121
Notional Amount	300,000	345,000
Derivative Assets | Loan purchase commitments
Derivative [Line Items]
Fair Value	4,996	3,315
Notional Amount	$ 802,550	$ 352,981

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

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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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