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TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Operating activities:          
Net income $ 8,336us-gaap_NetIncomeLoss $ 5,650us-gaap_NetIncomeLoss $ 8,234us-gaap_NetIncomeLoss $ 4,859us-gaap_NetIncomeLoss $ 7,365us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:          
Equity compensation vesting expense 324us-gaap_ShareBasedCompensation       296us-gaap_ShareBasedCompensation
Stock option excess tax benefits (18)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities       (184)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net cash provided by operating activities 12,961us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations       12,286us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Financing activities:          
Stock option excess tax benefits 18us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities       184us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Repurchase of common stock (27)us-gaap_PaymentsForRepurchaseOfCommonStock       (293)us-gaap_PaymentsForRepurchaseOfCommonStock
Cash dividends paid - common (2,515)us-gaap_PaymentsOfDividendsCommonStock       (1,772)us-gaap_PaymentsOfDividendsCommonStock
Net cash used for financing activities (33,234)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations       (554)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net change in cash and cash equivalents (329,500)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease       (96,117)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents and beginning of year 610,728us-gaap_CashAndCashEquivalentsAtCarryingValue     502,251us-gaap_CashAndCashEquivalentsAtCarryingValue 598,368us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 281,228us-gaap_CashAndCashEquivalentsAtCarryingValue 610,728us-gaap_CashAndCashEquivalentsAtCarryingValue     502,251us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent [Member]          
Operating activities:          
Net income 8,336us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      7,365us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities:          
Under distributed equity in earnings of Tri Counties Bank (6,584)tcbk_OverUnderDistributedEquityInEarnings
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      (5,679)tcbk_OverUnderDistributedEquityInEarnings
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity compensation vesting expense 324us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      296us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Stock option excess tax benefits (18)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      (184)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net change in other assets and liabilities (124)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      (360)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by operating activities 1,934us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      1,438us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Financing activities:          
Stock option excess tax benefits 18us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      184us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Issuance of common stock through option exercise 405us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      306us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repurchase of common stock (27)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      (293)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash dividends paid - common (2,515)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      (1,772)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used for financing activities (2,119)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      (1,575)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net change in cash and cash equivalents (185)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      (137)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents and beginning of year 2,229us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      2,520us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents at end of year $ 2,044us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
      $ 2,383us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember