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v3.20.2

Fair Value Measurement - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2020 USD ($) investment_security
Fair Value Disclosures [Abstract] |
Number of investment securities classified as level 3 (in investment securities) | investment_security | 0
Carrying value of loans fully charged-off | $ | $ 0

X
- Definition Loan charged off carrying value. + References No definition available. + Details
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Namespace Prefix: | tcbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of Investment Securities Classified as Level 3 + References No definition available. + Details
Name: | tcbk_NumberOfInvestmentSecuritiesClassifiedAsLevel3
Namespace Prefix: | tcbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration