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Federally Assisted Acquisition of San Joaquin Bank - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2009 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Investment [Line Items] |  |  |  |
Agreed percentage of loss in loss sharing agreement | 80.00% | 80.00% |  |
Loss recoveries on covered assets | $ 144,000,000 | $ 144,000,000 |  |
Loss amount with respect to covered assets | 26,700,000 | 26,700,000 |  |
Agreed percentage of reimbursement in loss reimburse agreement | 95.00% | 95.00% |  |
After-tax gain included in earnings due to purchase method | 12,300,000 |  |  |
Remaining discount associated with SJB loans |  | 25,300,000 |  |
Expected cash flows |  | 16,400,000 |  |
Remaining average lives of loan |  | 4 years 8 months 12 days |  |
Remaining average lives of loan |  | 1 year 1 month 21 days |  |
FDIC loss sharing asset |  | $ 18,489,000 | $ 59,453,000 | $ 101,461,000
Maximum contract life |  | 1 year 9 months |  |
Commercial Loans [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Loss sharing agreement term |  | 5 years |  |
Loss recovery provision term |  | 8 years |  |
Single Family Residential Loans [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Loss sharing agreement term |  | 10 years |  |
Loss recovery provision term |  | 10 years |  |

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