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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

X

- 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

X

- Definition

Financing Receivable, Threshold For Loan Analysis

+ References

No definition available.

+ Details

Name:	tcbk_FinancingReceivableThresholdForLoanAnalysis
Namespace Prefix:	tcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Loans Receivable, Impaired, Interest Lost on Nonaccrual Loans

+ References

No definition available.

+ Details

Name:	tcbk_LoansReceivableImpairedInterestLostOnNonaccrualLoans
Namespace Prefix:	tcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

Name:	us-gaap_FinancingReceivableNonaccrualInterestIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration