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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2020
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 9 months 25 days    
Number of units released 0    
Number of units increased 124,848    
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) 104,794 68,597  
Pre-tax compensation costs $ 3,211,517    
Number of units released 29,089    
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) 83,232 51,312  
Weighted-average remaining contractual term (in years) 2 years 3 months 29 days    
Pre-tax compensation costs $ 1,686,594    
Number of units released 20,265    
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