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Federally Assisted Acquisition of San Joaquin Bank (Details Textual) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 31, 2009 | Mar. 31, 2012 Commercial Loan [Member] | Mar. 31, 2012 Single Family Residential Loan [Member]
Servicing Assets at Fair Value [Line Items] |  |  |
Loss sharing agreement term |  | 5 years | 10 years
Loss recovery provision term |  | 8 years | 10 years
Additional Summary of the covered loans acquired in the acquisition (Textual) [Abstract] |  |  |
Agreed percentage of loss in Loss sharing agreement | 80.00% |  |
Loss recoveries on covered assets | $ 144.0 |  |
Loss amount with respect to covered assets | 26.7 |  |
Agreed percentage of reimbursement in Loss reimburse agreement | 95.00% |  |
After tax gain included in earnings due to purchase method | $ 12.3 |  |

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