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Derivative Financial Instruments and Hedging Activities - Summary of Changes in Notional Balances of Holdings of Derivatives (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value		$ 5,429	$ 9,279
Gains (losses) on derivatives		10	(1,387)	$ (1,377)
IRLCs [Member]
Derivative Notional Balance [Roll Forward]
Notional Amount, beginning balance		360,450
Additions		3,711,902
Amortization		0
Maturities		(3,221,782)
Terminations		(754,231)
Notional Amount, ending balance		96,339	360,450
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	[1]	$ 3,283	6,507
Maturity		Jan. 2018 - Mar. 2018
IRLCs [Member] | Gain on Loans Held for Sale Net [Member]
Fair value of derivative assets (liabilities) at:
Gains (losses) on derivatives		$ (3,089)	(55)
Forward Mortgage Backed Securities Trades [Member]
Derivative Notional Balance [Roll Forward]
Notional Amount, beginning balance		609,177
Additions		2,914,283
Amortization		0
Maturities		(2,289,228)
Terminations		(993,409)
Notional Amount, ending balance		240,823	609,177
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	[1]	$ (545)	(614)
Maturity		Feb. 2018
Forward Mortgage Backed Securities Trades [Member] | Gain on Loans Held for Sale Net [Member]
Fair value of derivative assets (liabilities) at:
Gains (losses) on derivatives		$ (8,529)	(6,592)
Interest Rate Cap [Member]
Derivative Notional Balance [Roll Forward]
Notional Amount, beginning balance		955,000
Additions		211,667
Amortization		(416,667)
Maturities		0
Terminations		(375,000)
Notional Amount, ending balance		375,000	955,000
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	[1]	$ 2,056	$ 1,836
Maturity		Jul. 2018 - Dec. 2019
[1] Derivatives are reported at fair value in Other assets or in Other liabilities on our consolidated balance sheets.

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

Represents amount for amortization of derivative instruments during the period.

+ References

No definition available.

+ Details

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- Definition

Represents an increase in derivative instruments during the period.

+ References

No definition available.

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- Definition

Represents amount for maturities of derivative instruments during the period.

+ References

No definition available.

+ Details

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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

-- None. No documentation exists for this element. --

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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 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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-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

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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-Publisher FASB
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-SubTopic 10
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