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Borrowings - Subordinated Debt (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
debenture
Sep. 30, 2017
USD ($)
Debt Instrument [Line Items]      
Accretion of discount on subordinated debentures   $ 92 $ 117
Amount guaranteed, on subordinated basis, distributions and other payments on trust preferred securities   $ 8,000  
Subordinated debenture      
Debt Instrument [Line Items]      
Number of subordinated debentures acquired | debenture   2  
Subordinated debentures   $ 4,950  
Contractual value of subordinated debt   8,248  
Accretion of discount on subordinated debentures   $ 92 $ 117
Debenture distribution deferral period (up to number of years)   5 years  
Subordinated debenture | NorCal Community Bancorp Trust I      
Debt Instrument [Line Items]      
Contractual value of subordinated debt   $ 4,124  
Effective interest rate   5.39%  
Subordinated debenture | NorCal Community Bancorp Trust II      
Debt Instrument [Line Items]      
Contractual value of subordinated debt   $ 4,124  
Effective interest rate   3.73%  
LIBOR | Subordinated debenture | NorCal Community Bancorp Trust I      
Debt Instrument [Line Items]      
Basis spread on subordinated debentures   3.05%  
LIBOR | Subordinated debenture | NorCal Community Bancorp Trust II      
Debt Instrument [Line Items]      
Basis spread on subordinated debentures   1.40%  
Subsequent Event | Subordinated debenture | NorCal Community Bancorp Trust I      
Debt Instrument [Line Items]      
Accretion of discount on subordinated debentures $ 916