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Acquisition - Narrative (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Nov. 21, 2017
USD ($)
branch
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]      
Goodwill $ 30,140,000   $ 6,436,000
Impairment on goodwill $ 0    
Minimum      
Business Acquisition [Line Items]      
Constant prepayment rate (CPR) 5.00%    
Maximum      
Business Acquisition [Line Items]      
Constant prepayment rate (CPR) 27.00%    
Bank of Napa, N.A. (Napa)      
Business Acquisition [Line Items]      
Loans acquired   $ 134,700,000  
Deposits assumed   249,886,000  
Investment securities acquired   $ 75,469,000  
Number of branch offices | branch   2  
Shares received by Napa shareholders in merger per acquiree share   0.307  
Goodwill   $ 23,705,000