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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Apr. 16, 2024
Apr. 16, 2019
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Options granted (in shares) 0 0      
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) 152,572 144,487      
Pre-tax compensation costs $ 3.5        
Number of units released (in shares) 78,403        
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) 144,715 123,102      
Pre-tax compensation costs $ 1.9        
Number of units released (in shares) 32,248        
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) 217,073        
2024 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       1,200,000  
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
Options granted (in shares) 0 0 0