Transfers of Residential Loans - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2013
Residential Loan Transfers Line Items
Recorded servicing assets	$ 27,605,000	$ 28,895,000
Residential Loan Transfers Accounted for as Sales [Member]
Residential Loan Transfers Line Items
Securitization period		30 days
Recorded servicing assets	36,300,000	37,600,000
Forward loans serviced number of days past due threshold		60 days or more
Transfered residential loans		300,000
Charge-offs, net of recoveries	0	0
Residential Loans Transfers Accounted for as Secured Borrowings [Member]
Residential Loan Transfers Line Items
Residential loans and real estate owned pledged as collateral	$ 6,900,000,000	$ 6,900,000,000

Net credit losses are charge-offs and are based on total loans outstanding during the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719

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- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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- Definition

Forward loans serviced number days past due threshold.

+ References

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- Definition

Securitization Period

+ References

No definition available.

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- Definition

Transferred Residential Loans 60 Days Or More Past Due

+ References

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