Loans - Changes in Accretable Yield for Covered Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Receivables [Abstract]
Balance, beginning of period	$ 209,865	$ 153,138	$ 223,799	$ 169,309
Accretion	(17,509)	(17,639)	(31,443)	(33,874)
Net increase in expected cash flows	(70,014)	120,884	(70,014)	120,948
Balance, end of period	$ 122,342	$ 256,383	$ 122,342	$ 256,383

Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

+ Details

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- Definition

Amount of decrease from accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

+ Details

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- Details

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- Definition

This item represents an additional accretion from re-forecasted estimated cash flows.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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