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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	$ 9,051		$ 9,051		$ 9,279
Gains (losses) on derivatives during the six months ended:
Gains (losses) on derivatives	(328)	$ (584)	31	$ (2,080)
Interest Rate Lock Commitments [Member]
Derivative Notional Balance
Notional balance at December 31, 2016			360,450
Additions			2,478,110
Amortization			0
Maturities			(2,117,572)
Terminations			(475,410)
Notional balance at June 30, 2017	245,578		$ 245,578
Maturity			Jul. 2017 - Sep. 2017
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	5,352		$ 5,352		6,507
Gains (losses) on derivatives during the six months ended:
Gains (losses) on derivatives			(1,428)	6,672
Forward MBS Trades [Member]
Derivative Notional Balance
Notional balance at December 31, 2016			609,177
Additions			1,802,148
Amortization			0
Maturities			(1,025,320)
Terminations			(993,409)
Notional balance at June 30, 2017	392,596		$ 392,596
Maturity			Aug. 2017
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	1,752		$ 1,752		(614)
Gains (losses) on derivatives during the six months ended:
Gains (losses) on derivatives			(6,184)	$ (21,626)
Interest Rate Caps [Member]
Derivative Notional Balance
Notional balance at December 31, 2016			955,000
Additions			110,000
Amortization			(180,000)
Maturities			0
Terminations			(160,000)
Notional balance at June 30, 2017	725,000		$ 725,000
Maturity			Oct. 2017 - May 2019
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	$ 1,937		$ 1,937		$ 1,836
Gains (losses) on derivatives during the six months ended:
Gains (losses) on derivatives			$ 31

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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- Definition

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+ References

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- Definition

Represents an increase in derivative instruments during the period.

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- Definition

Represents amount for maturities of derivative instruments during the period.

+ References

No definition available.

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Derivative Notional Balance [Roll Forward]

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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

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-Name Accounting Standards Codification
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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