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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Aug. 11, 2018
Aug. 11, 2017
Aug. 11, 2016
Aug. 11, 2015
Dec. 31, 2014
Mar. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                  
Outstanding options under the plan 1,055,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,102,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber           1,102,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Options currently not exercisable yet expected to vest 283,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber                
Weighted-average remaining contractual term 2 years 3 months 18 days                
Pre-tax compensation costs expected to recognize $ 1,562,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized                
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 31,061us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
30,920us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
          30,920us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
 
Weighted-average remaining contractual term 2 years 7 months 6 days                
Pre-tax compensation costs 489,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
               
Number of units granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
13,749us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
           
RSUs vesting grant date Aug. 11, 2014                
Number of units released 0tcbk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleaseInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
               
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%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_VestingAxis
= tcbk_ServiceConditionRestrictedStockUnitsMember
   
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 15,366us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_RestrictedStockUnitsMarketConditionMember
15,366us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_RestrictedStockUnitsMarketConditionMember
          15,366us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_RestrictedStockUnitsMarketConditionMember
 
Weighted-average remaining contractual term 2 years 4 months 24 days                
Pre-tax compensation costs $ 259,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_RestrictedStockUnitsMarketConditionMember
               
Number of units granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_RestrictedStockUnitsMarketConditionMember
            0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_RestrictedStockUnitsMarketConditionMember
 
Number of units released 0tcbk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleaseInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= tcbk_RestrictedStockUnitsMarketConditionMember
               
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 650,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
               
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 0tcbk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleaseInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VestingAxis
= tcbk_RestrictedStockUnitsMarketConditionMember
               
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                 1,650,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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 23,049tcbk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleaseInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= tcbk_RestrictedStockUnitsMarketConditionMember
               
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 1tcbk_NumberOfSharesToBeReducedPursuantToStockOptionForComputationOfAvailableNumberOfSharesForIssuance
/ us-gaap_PlanNameAxis
= tcbk_TwoThousandNinePlanMember
               
Number of shares to be reduced pursuant to restricted stock award for computation of available number of shares for issuance 2tcbk_NumberOfSharesToBeReducedPursuantToRestrictedStockAwardForComputationOfAvailableNumberOfSharesForIssuance
/ us-gaap_PlanNameAxis
= tcbk_TwoThousandNinePlanMember
               
Outstanding options under the plan 694,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tcbk_TwoThousandNinePlanMember
               
Options available for grant under the plan 822,146us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= tcbk_TwoThousandNinePlanMember
               
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 46,427us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= tcbk_TwoThousandNinePlanMember
               
2001 Plan [Member]                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                  
Outstanding options under the plan 361,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tcbk_TwoThousandOnePlanMember
               
Options available for grant under the plan 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= tcbk_TwoThousandOnePlanMember
               
Share based compensation grant expiry period 10 years