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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Outstanding options under the plan 1,080,350 1,080,350 1,246,370
Options currently not exercisable yet expected to vest 294,000 294,000  
Weighted-average remaining contractual term   2 years 7 months 6 days  
Pre-tax compensation costs expected to recognize $ 1,836,000 $ 1,836,000  
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 29,166 29,166 0
Number of units granted 29,025 29,025  
Weighted-average remaining contractual term   3 years  
Pre-tax compensation costs 599,000 599,000  
Number of units released       
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 13,749 13,749 0
Number of units granted   13,749  
Weighted-average remaining contractual term   2 years 10 months 24 days  
Pre-tax compensation costs $ 272,000 $ 272,000  
Number of units released       
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 650,000 650,000  
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 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   20,623  
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 1  
Number of shares to be reduced pursuant to restricted stock award for computation of available number of shares for issuance 2 2  
Outstanding options under the plan 683,500 683,500  
Options available for grant under the plan 851,952 851,952  
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 42,915 42,915  
2001 Plan [Member]
     
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Outstanding options under the plan 396,850 396,850  
Options available for grant under the plan 0 0  
Share based compensation grant expiry period   10 years