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Federally Assisted Acquisition of San Joaquin Bank - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Business Combinations [Abstract]  
Remaining discount associated with SJB loans $ 17.5
Expected cash flows 10.0
Remaining average lives of loan 4 years 8 months 12 days
Remaining average lives of loan 7 months 6 days
FDIC loss sharing asset $ 10.6
Maximum contract life 1 year 3 months 18 days