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Borrowings and Other Obligations - Subordinated Debt (Details)
$ in Thousands
12 Months Ended
Oct. 07, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 29, 2013
USD ($)
debenture
Debt Instrument [Line Items]        
Number of subordinated debentures acquired | debenture       2
Accretion of discount on subordinated debentures   $ 68 $ 1,025  
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 $ 68 $ 1,000  
Subordinated debenture       $ 2,140
Long-term debt       $ 4,120
Subordinated debenture | NorCal Community Bancorp Trust II        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.40%    
Interest rate, effective percentage   3.30%    
Subordinated debenture | Maximum        
Debt Instrument [Line Items]        
Debenture distribution deferral period   5 years