Foreclosed Assets - Summary of Activity in Balance of Foreclosed Assets (Detail) (USD $)	3 Months Ended
Mar. 31, 2015 Assets	Mar. 31, 2014 Assets
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net	$ 4,894,000	$ 6,262,000
Additions/transfers from loans	1,560,000	1,175,000
Dispositions/sales	(495,000)us-gaap_OtherRealEstateDisposals	(4,186,000)us-gaap_OtherRealEstateDisposals
Valuation adjustments	(67,000)	(36,000)
Ending balance, net	5,892,000	3,215,000
Ending valuation allowance	263,000tcbk_EndingValuationAllowance	121,000tcbk_EndingValuationAllowance
Ending number of foreclosed assets	30tcbk_EndingNumberOfForeclosedAssets	26tcbk_EndingNumberOfForeclosedAssets
Proceeds from sale of foreclosed assets	806,000	5,413,000
Gain on sale of foreclosed assets	311,000us-gaap_GainLossOnSaleOfOtherAssets	1,227,000us-gaap_GainLossOnSaleOfOtherAssets
Noncovered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net	4,449,000	5,588,000
Additions/transfers from loans	1,560,000	1,175,000
Dispositions/sales	(495,000)	(4,186,000)
Valuation adjustments	(67,000)	(26,000)
Ending balance, net	5,447,000	2,551,000
Ending valuation allowance	263,000	111,000
Ending number of foreclosed assets	29	22
Proceeds from sale of foreclosed assets	806,000	5,413,000
Gain on sale of foreclosed assets	311,000	1,227,000
Covered [Member]
Schedule Of Foreclosed Assets Activity [Line Items]
Beginning balance, net	445,000	674,000
Valuation adjustments		(10,000)
Ending balance, net	445,000	664,000
Ending valuation allowance		$ 10,000
Ending number of foreclosed assets	1	4

Additions transfers from loans related to foreclosed assets.

No definition available.

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

- Definition

Ending number of foreclosed assets.

+ References

No definition available.

+ Details

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

- Definition

Ending valuation allowance.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

Amount of gain (loss) on sale or disposal of other assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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

- Definition

Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Disposals of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

No definition available.

+ Details

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

- Definition

Valuation adjustments made to other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

No definition available.

+ Details

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

- Definition

The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfForeclosedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_StatementScenarioAxis=tcbk_ForeclosedAssetsCoveredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=tcbk_ForeclosedAssetsNoncoveredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: