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Business Combinations - Schedule of Fair Value of Consideration Transferred, Identifiable Net Assets Acquired and Resulting Goodwill (Detail) (USD $)
0 Months Ended
Oct. 03, 2014
Mar. 31, 2015
Dec. 31, 2014
Fair value of consideration transferred:      
Cash consideration $ 6,823us-gaap_PaymentsToAcquireBusinessesGross    
Liabilities assumed:      
Goodwill recognized   63,462,000us-gaap_Goodwill 63,462,000us-gaap_Goodwill
North Valley Bancorp [Member]      
Fair value of consideration transferred:      
Fair value of shares issued 151,303,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Cash consideration 7,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Total fair value of consideration transferred 151,310,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Asset acquired:      
Cash and cash equivalents 141,412,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Securities available for sale 17,288,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Securities held to maturity 189,950,000tcbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSecuritiesHeldToMaturity
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Restricted equity securities 5,378,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Loans 499,327,000tcbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Foreclosed assets 695,000tcbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedForeclosedAssets
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Premises and equipment 11,936,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Cash value of life insurance 38,075,000tcbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashSurrenderValueOfLifeInsurance
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Core deposit intangible 6,614,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Other assets 20,064,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Total assets acquired 930,739,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Liabilities assumed:      
Deposits 801,956,000tcbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Other liabilities 10,429,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Junior subordinated debt 14,987,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Total liabilities assumed 827,372,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Total net assets acquired 103,367,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember
   
Goodwill recognized $ 47,943,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= tcbk_NorthValleyBancorpMember