Retirement Plans - Expected Benefit Payments to Participants and Estimated Contributions to be Made by Company (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Retirement Benefits [Abstract]
Expected Benefit Payments to Participants, 2020	$ 1,555
Expected Benefit Payments to Participants, 2021	2,128
Expected Benefit Payments to Participants, 2022	2,179
Expected Benefit Payments to Participants, 2023	2,179
Expected Benefit Payments to Participants, 2024	2,191
Expected Benefit Payments to Participants, 2025-2029	10,956
Estimated Company Contributions, 2020	1,555
Estimated Company Contributions, 2021	2,128
Estimated Company Contributions, 2022	2,179
Estimated Company Contributions, 2023	2,179
Estimated Company Contributions, 2024	2,193
Estimated Company Contributions, 2025-2029	$ 10,956

Defined benefit plan estimated future employer contributions five fiscal years thereafter.

No definition available.

Name:	tcbk_DefinedBenefitPlanEstimatedFutureEmployerContributionsFiveFiscalYearsThereafter
Namespace Prefix:	tcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Defined benefit plan estimated future employer contributions in year five.

+ References

No definition available.

+ Details

Name:	tcbk_DefinedBenefitPlanEstimatedFutureEmployerContributionsInYearFive
Namespace Prefix:	tcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Defined benefit plan estimated future employer contributions in year four.

+ References

No definition available.

+ Details

Name:	tcbk_DefinedBenefitPlanEstimatedFutureEmployerContributionsInYearFour
Namespace Prefix:	tcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Defined benefit plan estimated future employer contributions in year three.

+ References

No definition available.

+ Details

Name:	tcbk_DefinedBenefitPlanEstimatedFutureEmployerContributionsInYearThree
Namespace Prefix:	tcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Defined benefit plan estimated future employer contributions in year two.

+ References

No definition available.

+ Details

Name:	tcbk_DefinedBenefitPlanEstimatedFutureEmployerContributionsInYearTwo
Namespace Prefix:	tcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant