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Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies [Line Items]      
Real Estate - owner-occupied percentage minimum for collateral 50.00%    
Goodwill $ 23,577,000 $ 23,577,000  
Intangible assets, accumulated amortization 2,317,000 2,117,000  
Intangible assets, net 583,000 783,000  
Amortization expense, intangible asset 200,000 414,000 414,000
Tax benefit from exercise of stock options 26,000 116,000 28,000
Service 1st Bank
     
Significant Accounting Policies [Line Items]      
Goodwill 14,643,000    
Bank of Madera County
     
Significant Accounting Policies [Line Items]      
Goodwill 8,934,000    
Core deposits
     
Significant Accounting Policies [Line Items]      
Estimated useful life of intangible asset 7 years    
Intangible asset, amortization expense - next 12 months 200,000    
Intangible asset, amortization expense, year two 200,000    
Intangible asset, amortization expense, year three 183,000    
Core deposits | Service 1st Bank
     
Significant Accounting Policies [Line Items]      
Intangible assets, gross 1,400,000    
Core deposits | Bank of Madera County
     
Significant Accounting Policies [Line Items]      
Intangible assets, gross $ 1,500,000    
Premises | Minimum
     
Significant Accounting Policies [Line Items]      
Estimated useful lives of premises and equipment 20    
Premises | Maximum
     
Significant Accounting Policies [Line Items]      
Estimated useful lives of premises and equipment 40    
Leasehold improvements, furniture, fixtures and equipment | Minimum
     
Significant Accounting Policies [Line Items]      
Estimated useful lives of premises and equipment 3    
Leasehold improvements, furniture, fixtures and equipment | Maximum
     
Significant Accounting Policies [Line Items]      
Estimated useful lives of premises and equipment 10