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Benefit Plans - Salary Continuation Plan (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
formerExecutive
Aug. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Percentage of salary paid upon retirement 25.00%    
Period before ratable vesting begins 5 years    
Age ratable vesting ends 65 years    
Liability under the Salary Continuation Plan | $ $ 5.3 $ 1.7 $ 3.2
Bank Of Napa      
Defined Benefit Plan Disclosure [Line Items]      
Number of former executives with salary continuation agreements 4    
Period for fixed annual retirement benefit payments 10 years    
Age ratable vesting ends 65 years    
American River Bank ARB      
Defined Benefit Plan Disclosure [Line Items]      
Number of former executives with salary continuation agreements 6    
Period for fixed annual retirement benefit payments 15 years    
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Payment period determined by service period 7 years    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Payment period determined by service period 15 years