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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Apr. 16, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]      
Weighted-average remaining contractual term (in years) 1 year 7 months 6 days    
Number of units released (in shares) 0    
Number of units increased (in shares) 149,645    
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) 102,934 99,809  
Pre-tax compensation costs $ 3,406    
Number of units released (in shares) 45,401    
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) 99,763 81,615  
Weighted-average remaining contractual term (in years) 1 year 9 months 18 days    
Pre-tax compensation costs $ 1,852    
Number of units released (in shares) 19,272    
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