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Derivative Financial Instruments - Additional Information (Detail) (USD $)			3 Months Ended		6 Months Ended							3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Cash Flow Hedging Interest Rate Swaps	Jun. 30, 2013 Cash Flow Hedging Interest Rate Swaps	Jun. 30, 2014 Cash Flow Hedging Interest Rate Swaps	Jun. 30, 2013 Cash Flow Hedging Interest Rate Swaps	Jun. 30, 2014 Unsecuritized Residential and Commercial Loans	Jun. 30, 2013 Unsecuritized Residential and Commercial Loans	Jun. 30, 2014 Unsecuritized Residential and Commercial Loans Interest Rate Contract	Jun. 30, 2014 Unsecuritized Residential and Commercial Loans Futures	Jun. 30, 2014 Unsecuritized Residential and Commercial Loans TBAs	Jun. 30, 2014 Loan Purchase and Forward Sales Commitments	Jun. 30, 2014 Loan Purchase and Forward Sales Commitments	Jun. 30, 2014 Maximum	Jun. 30, 2013 Maximum	Jun. 30, 2014 Maximum	Jun. 30, 2013 Maximum	Jun. 30, 2014 Maximum Interest Rate Swaps
Derivative [Line Items]
Notional Amount	$ 2,725,884,000	$ 1,488,922,000	$ 140,000,000		$ 140,000,000				$ 560,000,000	$ 126,000,000	$ 1,300,000,000
Valuation adjustments on derivatives			(5,000,000)	14,000,000	(14,000,000)	21,000,000	25,000,000	51,000,000				4,000,000	4,000,000
Net unrealized losses on interest rate agreements accounted for as cash flow hedges	30,000,000	16,000,000
Hedges decreased in value recorded as a component of interest expense														100,000	100,000	99,000	157,000
Accumulated other comprehensive loss that will be amortized into interest expense																		$ (1,000,000)

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

Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, That Will Be Amortized into Interest Expense

+ References

No definition available.

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580



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-Name Accounting Standards Codification

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

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-Paragraph 4A

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The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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