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Borrowings and Other Obligations - Lines of Credit (Details) - Line of credit - USD ($)
Aug. 26, 2021
Sep. 30, 2021
Aug. 06, 2021
Dec. 31, 2020
Federal home loan bank borrowings        
Line of Credit Facility [Line Items]        
Lines of credit   $ 651,400,000   $ 642,500,000
Federal home loan bank borrowings | American River Bank (ARB)        
Line of Credit Facility [Line Items]        
Lines of credit     $ 13,800,000  
Repayments of Lines of Credit $ 13,800,000      
Federal home loan bank overnight borrowings        
Line of Credit Facility [Line Items]        
Amount of borrowings outstanding   0   0
Federal reserve line of credit        
Line of Credit Facility [Line Items]        
Lines of credit   72,700,000   78,700,000
Amount of borrowings outstanding   0   0
Unsecured debt | Federal funds purchased        
Line of Credit Facility [Line Items]        
Lines of credit   115,000,000   135,000,000
Amount of borrowings outstanding   $ 0   $ 0