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Borrowings and Other Obligations - Subordinated Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Nov. 29, 2013
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]      
Accretion of discount on subordinated debenture   $ 52 $ 51
Amount guaranteed, on subordinated basis, distributions and other payments on trust preferred securities   4,000  
Subordinated debenture      
Debt Instrument [Line Items]      
Subordinated debenture $ 2,140    
Contractual value of subordinated debt $ 4,120    
Accretion of discount on subordinated debenture   $ 52 $ 51
Debenture distribution deferral period (up to number of years) 5 years    
Subordinated debenture | NorCal Community Bancorp Trust II      
Debt Instrument [Line Items]      
Basis spread on subordinated debentures   1.40%  
Effective interest rate   1.65%