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Acquisition - Core Deposit Intangible (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of core deposit intangible $ 529 $ 533 $ 619
Core deposit intangible      
Future Amortization Expense:      
2018 921    
2019 887    
2020 853    
2021 818    
2022 782    
Thereafter 2,231    
Total $ 6,492    
Bank of Napa, N.A. (Napa) | Core deposit intangible      
Acquired Finite-Lived Intangible Assets [Line Items]      
Core deposit intangible useful life 10 years    
Amortization of core deposit intangible $ 56    
Future Amortization Expense:      
2018 508    
2019 499    
2020 488    
2021 475    
2022 460    
Thereafter 1,955    
Total $ 4,385