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Federally Assisted Acquisition of San Joaquin Bank (Details Textual) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
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Additional Summary of the covered loans acquired in the acquisition (Textual) [Abstract] |  |
Remaining discount associated with SJB loans | $ 36,500,000 |
Expected cash flows | 17,000,000 |
Remaining average lives of loan | 4 years 6 months |
Remaining average lives of loan | 2 years |
FDIC loss sharing asset | $ 40,897,000 | $ 59,453,000
Maximum contract life | 2 years 6 months |

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