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Leases - Additional Information (Detail)	9 Months Ended
	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

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration