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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
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) 122,423      
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) 104,572   68,597  
Pre-tax compensation costs $ 2,782,321      
Number of units released (in shares) 31,708      
RSUs granted (in shares) 64,036      
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) 81,615   51,312  
Weighted-average remaining contractual term (in years) 2 years 1 month 6 days      
Pre-tax compensation costs $ 1,469,701      
Number of units released (in shares) 20,265      
RSUs granted (in shares) 46,416      
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
RSUs granted (in shares) 0 0