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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 11, 2018
Aug. 11, 2017
Aug. 11, 2016
Aug. 11, 2015
Dec. 31, 2014
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                  
Outstanding options under the plan         1,102,850 1,034,850     1,102,850
Options currently not exercisable yet expected to vest           279,000      
Weighted-average remaining contractual term           1 year 9 months 18 days      
Pre-tax compensation costs expected to recognize           $ 2,003,000      
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         30,920 47,683     30,920
Weighted-average remaining contractual term           1 year 9 months 18 days      
Pre-tax compensation costs           $ 881,000      
Number of units granted         13,749 30,348 0 0  
RSUs vesting grant date           Aug. 11, 2014      
Percentage of vesting schedule       25.00%          
Number of units released           11,652      
Restricted Stock Units (RSUs) [Member] | Service Condition Vesting RSUs [Member] | Forecast [Member]                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                  
Percentage of vesting schedule 25.00% 25.00% 25.00%            
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         15,366 33,714     15,366
Weighted-average remaining contractual term           2 years 3 months 18 days      
Pre-tax compensation costs           $ 535,000      
Number of units granted           18,348     0
Minimum [Member]                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                  
Maximum aggregate number of shares of TriCo's common stock issued           650,000      
Minimum [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           0      
Maximum [Member]                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                  
Maximum aggregate number of shares of TriCo's common stock issued               1,650,000  
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           50,571      
2009 Plan [Member]                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                  
Number of shares to be reduced pursuant to stock option for computation of available number of shares for issuance           1      
Number of shares to be reduced pursuant to restricted stock award for computation of available number of shares for issuance           2      
Outstanding options under the plan           694,000      
Options available for grant under the plan           728,902      
2009 Plan [Member] | Restricted Stock Units (RSUs) [Member]                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                  
Number of units outstanding expected to vest           81,397      
2001 Plan [Member]                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                  
Outstanding options under the plan           340,850      
Options available for grant under the plan           0      
Share based compensation grant expiry period           10 years