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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Fair Value	$ (40,207,000)	$ (29,734,000)
Notional Amount	6,128,754,000	4,980,343,000
Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Notional Amount	140,000,000
TBAs
Derivative [Line Items]
Notional Amount	2,120,000,000	1,360,000,000
Futures
Derivative [Line Items]
Notional Amount	60,000,000	88,000,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(66,867,000)	(66,329,000)
Notional Amount	3,414,943,000	2,423,362,000
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(13,237,000)	(12,097,000)
Notional Amount	1,693,500,000	1,101,500,000
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(43,059,000)	(44,822,000)
Notional Amount	139,500,000	139,500,000
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(9,743,000)	(4,681,000)
Notional Amount	1,275,000,000	510,000,000
Derivative Liabilities | Futures
Derivative [Line Items]
Fair Value	(55,000)	(928,000)
Notional Amount	50,000,000	87,500,000
Derivative Liabilities | Loan purchase commitments
Derivative [Line Items]
Fair Value	(773,000)	(3,801,000)
Notional Amount	256,943,000	584,862,000
Derivative Assets
Derivative [Line Items]
Fair Value	26,660,000	36,595,000
Notional Amount	2,713,811,000	2,556,981,000
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	9,951,000	19,859,000
Notional Amount	830,000,000	1,009,000,000
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	9,535,000	8,300,000
Notional Amount	845,000,000	850,000,000
Derivative Assets | Futures
Derivative [Line Items]
Fair Value	13,000	0
Notional Amount	10,000,000	0
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	1,601,000	5,121,000
Notional Amount	300,000,000	345,000,000
Derivative Assets | Loan purchase commitments
Derivative [Line Items]
Fair Value	5,560,000	3,315,000
Notional Amount	$ 728,811,000	$ 352,981,000

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/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

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+ References

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