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Business Combinations - Schedule of Cost Basis, Fair Value Discount and loan Acquired (Detail) (North Valley Bancorp [Member], USD $)
In Thousands, unless otherwise specified
Oct. 03, 2014
Business Acquisition [Line Items]  
Cost Basis $ 514,125us-gaap_InvestmentOwnedBalancePrincipalAmount
Discount (14,798)tcbk_PurchaseDiscount
Fair Value 499,327us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
PNCI [Member]
  
Business Acquisition [Line Items]  
Cost Basis 502,637us-gaap_InvestmentOwnedBalancePrincipalAmount
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= tcbk_PurchaseNotCreditImpairedLoansMember
Discount (12,721)tcbk_PurchaseDiscount
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= tcbk_PurchaseNotCreditImpairedLoansMember
Fair Value 489,916us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= tcbk_PurchaseNotCreditImpairedLoansMember
PCI - Other [Member]
  
Business Acquisition [Line Items]  
Cost Basis 11,488us-gaap_InvestmentOwnedBalancePrincipalAmount
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= tcbk_PurchaseCreditImpairedLoansMember
Discount (2,077)tcbk_PurchaseDiscount
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= tcbk_PurchaseCreditImpairedLoansMember
Fair Value $ 9,411us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= tcbk_PurchaseCreditImpairedLoansMember