Derivative Financial Instruments and Hedging Activities - Schedule of Changes in Notional Balance of Holdings of Derivatives (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	$ 9,545	$ 6,065
Interest Rate Lock Commitments [Member]
Derivative Notional Balance [Roll Forward]
Beginning notional balance	239,406
Additions	1,288,957
Amortization
Maturities	(964,465)
Terminations	(144,390)
Ending notional balance	419,508
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	9,516	6,065
Maturity	Apr. 2015 - Jun. 2015
Forward Mortgage Backed Securities Trades [Member]
Derivative Notional Balance [Roll Forward]
Beginning notional balance	703,725
Additions	2,481,134
Amortization	69,773
Maturities	(1,121,701)
Terminations	(1,349,218)
Ending notional balance	783,713
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	(5,249)	(2,854)
Maturity	May 2015 - June 2015
Interest Rate Cap [Member]
Derivative Notional Balance [Roll Forward]
Beginning notional balance	1,729,000
Additions
Amortization	(102,000)
Maturities
Terminations
Ending notional balance	1,627,000
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	203	567
Maturity	Nov. 2016 - Oct. 2017
Interest Rate Swap [Member]
Derivative Notional Balance [Roll Forward]
Beginning notional balance	0
Additions	450,000
Amortization	0
Maturities	0
Terminations	(450,000)
Ending notional balance	0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	$ 0	$ 0

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

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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- Definition

Represents amount for amortization of derivative instruments during the period.

+ References

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Represents an increase in derivative instruments during the period.

+ References

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- Definition

Represents amount for maturities of derivative instruments during the period.

+ References

No definition available.

+ Details

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- Definition

Represents a maturity period of derivative.

+ References

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- Definition

Represents amount for termination of derivative instruments during the period.

+ References

No definition available.

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- 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 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

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 15

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611

Reference 4: 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

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