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Borrowings and Other Obligations - Subordinated Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 07, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Debt Instrument [Line Items]        
Accretion of discount on subordinated debentures   $ 17 $ 33  
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 17 $ 33  
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       4.01%