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Deposits - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Deposits [Line Items]
Overdrawn deposit balances classified as consumer loans	$ 813	$ 985
California
Schedule Of Deposits [Line Items]
Certificate of deposits, included in time certificates, over $250,000	$ 10,000	$ 10,000

X

- 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

X

- 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

X

- 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

X

- Details

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