Goodwill and Intangible Assets	3 Months Ended
Goodwill and Intangible Assets	Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Business combinations involving the Company’s acquisition of the equity interests or net assets of another enterprise give rise to goodwill. Total goodwill at March 31, 2013 was $23,577,000 consisting of $14,643,000 and $8,934,000 representing the excess of the cost of Service 1st Bancorp and Bank of Madera County, respectively, over the net amounts assigned to assets acquired and liabilities assumed in the transactions accounted for under the purchase method of accounting. The value of goodwill is ultimately derived from the Company’s ability to generate net earnings after the acquisitions and is not deductible for tax purposes. A decline in net earnings could be indicative of a decline in the fair value of goodwill and result in impairment. For that reason, goodwill is assessed at least annually for impairment. The Company has selected September 30 as the date to perform the annual impairment test. Management assessed qualitative factors including performance trends and noted no factors indicating goodwill impairment. Goodwill is also tested for impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of the Company below its carrying amount. No such events or circumstances arose during the first three months of 2013. The intangible assets at March 31, 2013 represent the estimated fair value of the core deposit relationships acquired in the acquisition of Service 1st Bancorp in 2008 of $1,400,000 and the 2005 acquisition of Bank of Madera County of $1,500,000. Core deposit intangibles are being amortized by the straight-line method (which approximates the effective interest method) over an estimated life of seven years from the date of acquisition. The carrying value of intangible assets at March 31, 2013 was $533,000 net of $2,367,000 in accumulated amortization expense. Management evaluates the remaining useful lives quarterly to determine whether events or circumstances warrant a revision to the remaining periods of amortization. Based on the evaluation, no changes to the remaining useful lives was required in the first quarter of 2013. Management performed an annual impairment test on core deposit intangibles as of September 30, 2012 and determined no impairment was necessary. Amortization expense recognized was $50,000 and $50,000 for the three month periods ended March 31, 2013 and 2012, respectively.

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

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