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Federally Assisted Acquisition of San Joaquin Bank - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]
Acquisition date	Oct. 16, 2009
Remaining discount associated with SJB loans	$ 14.5
Expected cash flows	9.0
Remaining average lives of loan	4 years 4 months 24 days
Remaining average lives of loan	1 year
FDIC loss sharing asset	$ 7.0
Maximum contract life	1 year

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Topic 805

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-Section 25

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-URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e848-128460



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