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Stock Options and Other Equity-Based Incentive Instruments (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Stock Options and Other Equity-Based Incentive Instruments (Textual) [Abstract]    
Outstanding options under the plan 1,381,435 1,393,935
Stock Options and Other Equity Based Incentive Instruments (Additional Textual) [Abstract]    
Options currently not exercisable yet expected to vest 333,889  
Weighted-average remaining contractual term 3 years 3 months 18 days  
Pre-tax compensation costs expected to recognize $ 2,308,000  
Maximum [Member]
   
Stock Options and Other Equity-Based Incentive Instruments (Textual) [Abstract]    
Maximum aggregate number of shares of TriCo's common stock issued 1,650,000  
Minimum [Member]
   
Stock Options and Other Equity-Based Incentive Instruments (Textual) [Abstract]    
Maximum aggregate number of shares of TriCo's common stock issued 650,000  
2009 Plan [Member]
   
Stock Options and Other Equity-Based Incentive Instruments (Textual) [Abstract]    
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 585,500  
Options available for grant under the plan 1,064,500  
2001 Plan [Member]
   
Stock Options and Other Equity-Based Incentive Instruments (Textual) [Abstract]    
Share based compensation grant expiry period 10 years  
Outstanding options under the plan 795,935  
Options available for grant under the plan 0