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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Apr. 16, 2024
Apr. 16, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of options (in shares) 0 0    
Weighted-average remaining contractual term (in years) 1 year 8 months 26 days      
Restricted Stock Units (RSUs) | Service Condition Vesting RSUs        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of units outstanding expected to vest (in shares) 153,779 152,572    
Pre-tax compensation costs $ 3.9      
Number of units released (in shares) 75,845      
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of units outstanding expected to vest (in shares) 177,868 144,715    
Weighted-average remaining contractual term (in years) 1 year 10 months 24 days      
Pre-tax compensation costs $ 2.0      
Number of units released (in shares) 7,911      
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs | Minimum        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of units released (in shares) 0      
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs | Maximum        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of units released (in shares) 266,802      
2024 Plan        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Aggregate number of shares of TriCo's common stock issued (in shares)     1,200,000  
2019 Plan        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Aggregate number of shares of TriCo's common stock issued (in shares)       1,500,000