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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Apr. 16, 2019
Dec. 31, 2018
Restricted Stock Units (RSUs) [Member] | Market Plus Service Condition Vesting RSUs [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of units outstanding expected to vest 53,611 53,611   45,536
Weighted-average remaining contractual term   2 years 1 month 6 days    
Pre-tax compensation costs $ 1,227,000 $ 1,227,000    
Number of units released   22,237    
Restricted Stock Units (RSUs) [Member] | Service Condition Vesting RSUs [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of units outstanding expected to vest 76,527 76,527   66,947
Options available for grant under the plan 76,527 76,527    
Options currently not exercisable yet expected to vest 750 750    
Weighted-average remaining contractual term 1 year 4 months 24 days      
Pre-tax compensation costs $ 2,495,000 $ 2,495,000    
Number of units released   26,211    
Maximum [Member] | Restricted Stock Units (RSUs) [Member] | Market Plus Service Condition Vesting RSUs [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Number of units released 80,417      
2019 Plan [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Aggregate number of shares of TriCo's common stock issued     1,500,000  
2009 Plan [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
2009 plan Expired   Mar. 26, 2019