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v3.20.2

Leases - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2020 renewal_option
Leases [Abstract] |
Number of lease renewal options (in renewal options) | 1

X
- Definition Lessee, Operating Lease, Number of Renewal Term Options + References No definition available. + Details
Name: | tcbk_LesseeOperatingLeaseNumberOfRenewalTermOptions
Namespace Prefix: | tcbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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