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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
shares
Dec. 31, 2021
shares
Apr. 30, 2019
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding options under the plan (in shares) 7,500 15,500 78,825  
Options granted (in shares) 0 0    
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of units outstanding expected to vest (in shares) 123,102 114,481    
Pre-tax compensation costs | $ $ 2.3      
Number of units released (in shares) 55,928      
Restricted Stock Units (RSUs) | Service Condition Vesting RSUs        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of units outstanding expected to vest (in shares) 144,487 139,194    
Pre-tax compensation costs | $ $ 4.0      
Number of units released (in shares) 81,902      
Minimum | Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of units released (in shares) 0      
Maximum | Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of units released (in shares) 184,653      
2009 Plan        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding options under the plan (in shares) 7,500      
2019 Plan        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Aggregate number of shares of TriCo's common stock issued       1,500,000
Percentage of shares acquired 0.50      
Common stock issued pursuant to stock option (in shares) 1      
Common stock issued pursuant to performance award (in shares) 2      
Outstanding options under the plan (in shares) 0      
Options granted (in shares) 0 0 0  
2019 Plan | Restricted Stock Units (RSUs)        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
RSUs outstanding (in shares) 144,487      
2019 Plan | Minimum        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Award vesting period 1 year      
2019 Plan | Maximum        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options available for grant under the plan (in shares) 517,773