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Deposits - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule Of Deposits [Line Items] |  |
Overdrawn deposit balances classified as consumer loans | $ 1,139 | $ 1,550
California |  |
Schedule Of Deposits [Line Items] |  |
Certificate of deposits, included in time certificates, over $250,000 | $ 30,000 | $ 30,000

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- Definition Certificate of deposit included in time certificates. + References No definition available. + Details
Name: | tcbk_CertificateOfDepositIncludedInTimeCertificates
Namespace Prefix: | tcbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Schedule Of Deposits [Line Items] + References No definition available. + Details
Name: | tcbk_ScheduleOfDepositsLineItems
Namespace Prefix: | tcbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
Name: | us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |