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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Apr. 16, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]      
Weighted-average remaining contractual term (in years) 2 years 2 months 12 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) 210,559 144,487  
Pre-tax compensation costs $ 5.4    
Number of units released (in shares) 0    
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) 178,414 123,102  
Weighted-average remaining contractual term (in years) 2 years 3 months 18 days    
Pre-tax compensation costs $ 3.0    
Number of units released (in shares) 0    
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) 267,621    
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