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Cash Value of Life Insurance (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) company employee policy	Dec. 31, 2023 USD ($) policy employee company	Dec. 31, 2022 USD ($)
Insurance [Roll Forward]
Beginning balance	$ 136,892	$ 133,742
Increase in cash value of life insurance	3,257	3,150	$ 2,858
Ending balance	140,149	136,892	$ 133,742
End of period death benefit	$ 224,723	$ 224,021
Number of policies owned (in policies) | policy	216	216
Insurance companies used (in companies) | company	14	14
Current and former employees and directors covered (in employees) | employee	79	79

X

- Definition

Current and former employees and directors covered .

+ References

No definition available.

+ Details

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Namespace Prefix:	tcbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

End of period death benefit.

+ References

No definition available.

+ Details

Name:	tcbk_EndOfPeriodDeathBenefit
Namespace Prefix:	tcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Insurance companies used.

+ References

No definition available.

+ Details

Name:	tcbk_InsuranceCompaniesUsed
Namespace Prefix:	tcbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Insurance

+ References

No definition available.

+ Details

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Namespace Prefix:	tcbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of policies owned.

+ References

No definition available.

+ Details

Name:	tcbk_NumberOfPoliciesOwned
Namespace Prefix:	tcbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

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

X

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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