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Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Allowance For Loan And Lease Losses [Abstract] |  |  |  |
Threshold for loan analysis | $ 1.0 |  | $ 1.0 |
Interest lost on nonaccrual loans | 0.2 | $ 1.6 | 3.4 | $ 3.0
Interest income on nonaccrual loans | $ 0.1 | $ 0.5 | $ 0.4 | $ 0.6

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- Definition Allowance For Loan And Lease Losses [Abstract] + References No definition available. + Details
Name: | tcbk_AllowanceForLoanAndLeaseLossesAbstract
Namespace Prefix: | tcbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing Receivable, Threshold For Loan Analysis + References No definition available. + Details
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Namespace Prefix: | tcbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Loans Receivable, Impaired, Interest Lost on Nonaccrual Loans + References No definition available. + Details
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Namespace Prefix: | tcbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of interest income on financing receivable on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration