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Borrowings - Subordinated Debt (Details)
$ in Thousands
12 Months Ended
Nov. 29, 2013
USD ($)
debenture
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Number of subordinated debentures acquired | debenture 2      
Accretion of discount on subordinated debentures   $ 191 $ 210 $ 216
Amount guaranteed, on subordinated basis, distributions and other payments on trust preferred securities   8,000    
Subordinated debentures   5,586 5,395  
Subordinated debenture        
Debt Instrument [Line Items]        
Subordinated debenture $ 4,950      
Long-term Debt, Gross $ 8,200 8,248    
Accretion of discount on subordinated debentures   191 210 $ 216
Subordinated debentures   5,586 $ 5,395  
Subordinated debenture | NorCal Community Bancorp Trust I        
Debt Instrument [Line Items]        
Long-term Debt, Gross   $ 4,124    
Effective interest rate   3.93%    
Basis spread on subordinated debenture   3.05%    
Subordinated debenture | NorCal Community Bancorp Trust II        
Debt Instrument [Line Items]        
Long-term Debt, Gross   $ 4,124    
Effective interest rate   2.36%    
Basis spread on subordinated debenture   1.40%    
Subordinated debenture | Maximum        
Debt Instrument [Line Items]        
Debenture distribution deferral period 5 years