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Acquisition of Sierra Vista Bank - Narrative (Details)
shares in Thousands
12 Months Ended
Oct. 01, 2016
USD ($)
branches
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Business Acquisition [Line Items]          
Goodwill   $ 40,231,000 $ 29,917,000 $ 29,917,000 $ 29,917,000
Acquisition and integration expenses   $ 1,782,000 $ 0 $ 0  
Sierra Vista Bank          
Business Acquisition [Line Items]          
Total assets acquired $ 155,154,000        
Estimated number of shares to be issued in merger transaction | shares 1,059        
Cash $ 9,468,000        
Goodwill 10,314,000        
Non-impaired loans 121,902,000        
Customer receivables 124,396,000        
Core deposit intangible $ 508,000        
Folsom, California [Member] | Sierra Vista Bank          
Business Acquisition [Line Items]          
Number of branches to be acquired | branches 1        
Fair Oaks, California [Member] | Sierra Vista Bank          
Business Acquisition [Line Items]          
Number of branches to be acquired | branches 1        
Cameron Park, California [Member] | Sierra Vista Bank          
Business Acquisition [Line Items]          
Number of branches to be acquired | branches 1        
Core deposits          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets useful life   10 years