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Goodwill and Intangible Assets (Details) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Core Deposits
Jun. 30, 2013
Service 1st Bank [Member]
Dec. 31, 2008
Service 1st Bank [Member]
Core Deposits
Jun. 30, 2013
Bank of Madera County [Member]
Dec. 31, 2005
Bank of Madera County [Member]
Core Deposits
Goodwill and Intangible Assets                    
Goodwill $ 23,577,000   $ 23,577,000   $ 23,577,000   $ 14,643,000   $ 8,934,000  
Core deposit relationships acquired               1,400,000   1,500,000
Finite-Lived Intangible Asset, Useful Life           7 years        
Intangible assets, net 483,000   483,000   583,000          
Intangible assets, accumulated amortization 2,417,000   2,417,000              
Amortization of intangible assets $ 50,000 $ 50,000 $ 100,000 $ 100,000