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Borrowings and Other Obligations - Schedule of Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 25, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aug. 06, 2021
Debt Instrument [Line Items]          
FHLB fixed-rate advances, Carrying Value   $ 0 $ 0 $ 0  
Subordinated debenture, Carrying Value   0 2,777    
FHLB fixed-rate advances, Average Balance   $ 642 $ 0 $ 0  
FHLB fixed-rate advances, Average Rate   1.18% 0.00% 0.00%  
Other obligations (finance leases)          
Debt Instrument [Line Items]          
Other Obligations Carrying Value   $ 419 $ 58 $ 212  
Other Obligations Average Balance   $ 250 $ 132 $ 279  
Borrowings, Average Rate   0.71% 2.62% 2.85%  
Subordinated debenture          
Debt Instrument [Line Items]          
Subordinated debenture, Carrying Value   $ 0 $ 2,777 $ 2,708  
Subordinated debenture, Average Balance   $ 534 $ 2,741 $ 2,673  
Borrowings, Average Rate   251.54% 5.68% 8.44%  
Line of Credit | American River Bank ARB | Federal Home Loan Bank Borrowings          
Debt Instrument [Line Items]          
Lines of credit         $ 13,900
Repayments of lines of credit $ 13,900        
Federal Home Loan Bank Borrowings | Line of Credit          
Debt Instrument [Line Items]          
FHLB overnight borrowings and advances, Carrying Value   $ 0 $ 0 $ 0  
FHLB overnight borrowings and advances, Average Balance   $ 0 $ 42 $ 2,656  
Borrowings, Average Rate   0.00% 0.75% 2.55%