XML 52 R39.htm IDEA: XBRL DOCUMENT v3.6.0.2
Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
payment
branch
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Entity Location [Line Items]      
Number of consecutive payments considered sustained repayment performance | payment 6    
Threshold period a past due loan is charged off 90 days    
Threshold period a past due overdraft account is charged off 60 days    
Ownership interest in each limited partnerships formed for affordable housing projects (less than) 2.00%    
Advertising costs | $ $ 565 $ 334 $ 400
Commitments under operating leases | $ $ 21,082    
Marin County      
Entity Location [Line Items]      
Number of branches 10    
Napa County      
Entity Location [Line Items]      
Number of branches 1    
San Francisco      
Entity Location [Line Items]      
Number of branches 1    
Sonoma County      
Entity Location [Line Items]      
Number of branches 5    
Alameda County      
Entity Location [Line Items]      
Number of branches 3