v3.26.1
Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
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) 2 years      
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) 125,774 141,089    
Pre-tax compensation costs $ 4.4      
Number of units released (in shares) 79,543      
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) 142,096 145,485    
Weighted-average remaining contractual term (in years) 2 years 3 months 18 days      
Pre-tax compensation costs $ 2.4      
Number of units released (in shares) 48,842      
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) 213,144      
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