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Borrowings and Other Obligations - Subordinated Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 07, 2018
Nov. 29, 2013
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]        
Accretion of discount on subordinated debentures     $ 51 $ 92
Amount guaranteed, on subordinated basis, distributions and other payments on trust preferred securities     4,000  
Subordinated debenture        
Debt Instrument [Line Items]        
Accretion of discount on subordinated debentures $ 916   $ 51 $ 92
Subordinated debentures   $ 2,140    
Contractual value of subordinated debt   $ 4,120    
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     3.52%