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Federally Assisted Acquisition of San Joaquin Bank - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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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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