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Acquisitions - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
USD ($)
branch
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]            
Goodwill   $ 53,777   $ 53,777   $ 53,777
Acquisition and integration   $ 0 $ 163 $ 217 $ 618  
Folsom Lake Bank            
Business Acquisition [Line Items]            
Consideration transferred $ 28,475          
Equity interest issued (in shares) | shares 1,276,888          
Total assets $ 196,148          
Goodwill 13,466          
Intangible assets other than goodwill $ 1,879          
Folsom Lake Bank | Folsom, and Rancho Cordova, California            
Business Acquisition [Line Items]            
Number of branches acquired | branch 2          
Folsom Lake Bank | Core deposits            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets useful life   10 years