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Acquisitions - Narrative (Details)
$ in Thousands
12 Months Ended
Oct. 01, 2017
USD ($)
branch
shares
Oct. 01, 2016
USD ($)
branch
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]            
Goodwill     $ 53,777 $ 40,231 $ 29,917 $ 29,917
Acquisition and integration expenses         $ 0  
Core deposits            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets useful life     8 years      
Folsom Lake Bank            
Business Acquisition [Line Items]            
Consideration transferred $ 28,475          
Estimated number of shares to be issued in merger transaction (in shares) | shares 1,276,888          
Number of branches to be acquired | branch 2          
Total assets acquired $ 196,148          
Goodwill 13,466   $ 13,466      
Core deposit intangible 1,879          
Acquisition and integration expenses     $ 1,828      
Non-impaired loans 117,815          
Customer receivables $ 121,872          
Folsom Lake Bank | Core deposits            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets useful life     10 years      
Sierra Vista Bank            
Business Acquisition [Line Items]            
Consideration transferred   $ 26,261        
Estimated number of shares to be issued in merger transaction (in shares) | shares   1,058,851        
Total assets acquired   $ 155,154        
Goodwill   10,314 $ 10,394      
Core deposit intangible   508        
Acquisition and integration expenses       $ 1,782    
Cash   9,468        
Non-impaired loans   121,902        
Customer receivables   124,396        
Core deposit intangible   $ 508        
Sierra Vista Bank | Core deposits            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets useful life     10 years      
Sierra Vista Bank | Folsom, California [Member]            
Business Acquisition [Line Items]            
Number of branches to be acquired | branch   1        
Sierra Vista Bank | Fair Oaks, California [Member]            
Business Acquisition [Line Items]            
Number of branches to be acquired | branch   1        
Sierra Vista Bank | Cameron Park, California [Member]            
Business Acquisition [Line Items]            
Number of branches to be acquired | branch   1