Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 85,376	$ 91,847	$ 91,847
Charge-offs	(743)	(226)	(2,392)
ACL on PCD Loans	2,037
Recoveries	1,174	560	3,086
Provision for (Benefit from) Credit Losses	8,205	(6,240)	(7,165)
Ending Balance	96,049	85,941	85,376
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	3,790	3,400	3,400
Charge-offs	0	0	0
ACL on PCD Loans	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	125	180	390
Ending Balance	3,915	3,580	3,790
Credit Loss [Roll Forward]
Beginning Balance	89,166	95,247	95,247
ACL on PCD Loans	2,037
Charge-offs	(743)	(226)	(2,392)
Recoveries	1,174	560	3,086
Provision for (Benefit from) Credit Losses	8,330	(6,060)	(6,775)
Ending Balance	99,964	89,521	89,166
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	51,140	53,693	53,693
Charge-offs	(294)	0	(144)
ACL on PCD Loans	1,573
Recoveries	0	3	806
Provision for (Benefit from) Credit Losses	2,573	(3,293)	(3,215)
Ending Balance	54,992	50,403	51,140
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	23,474	25,148	25,148
Charge-offs	(119)	(193)	(751)
ACL on PCD Loans	144
Recoveries	286	401	1,501
Provision for (Benefit from) Credit Losses	(106)	(752)	(2,424)
Ending Balance	23,679	24,604	23,474
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,862	4,252	4,252
Charge-offs	(330)	(33)	(1,470)
ACL on PCD Loans	81
Recoveries	887	136	755
Provision for (Benefit from) Credit Losses	4,542	109	325
Ending Balance	9,042	4,464	3,862
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5,667	7,540	7,540
Charge-offs	0	0	(27)
ACL on PCD Loans	201
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	1,569	(2,064)	(1,846)
Ending Balance	7,437	5,476	5,667
Agriculture production
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,215	1,209	1,209
Charge-offs	0	0	0
ACL on PCD Loans	38
Recoveries	1	20	24
Provision for (Benefit from) Credit Losses	(371)	(241)	(18)
Ending Balance	883	988	1,215
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	18	5	5
Charge-offs	0	0	0
ACL on PCD Loans	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	(2)	1	13
Ending Balance	16	6	18
CRE non-owner occupied \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	25,739	29,380	29,380
Charge-offs	0	0	0
ACL on PCD Loans	746
Recoveries	0	2	12
Provision for (Benefit from) Credit Losses	1,570	(2,948)	(3,653)
Ending Balance	28,055	26,434	25,739
CRE owner occupied \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,691	10,861	10,861
Charge-offs	0	0	(18)
ACL on PCD Loans	63
Recoveries	0	1	794
Provision for (Benefit from) Credit Losses	1,317	(988)	(946)
Ending Balance	12,071	9,874	10,691
Multifamily \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	12,395	11,472	11,472
Charge-offs	0	0	0
ACL on PCD Loans	0
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	(408)	899	923
Ending Balance	11,987	12,371	12,395
Farmland \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,315	1,980	1,980
Charge-offs	(294)	0	(126)
ACL on PCD Loans	764
Recoveries	0	0	0
Provision for (Benefit from) Credit Losses	94	(256)	461
Ending Balance	2,879	1,724	2,315
SFR 1-4 1st DT liens \| Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,723	10,117	10,117
Charge-offs	0	0	(145)
ACL on PCD Loans	144
Recoveries	40	10	13
Provision for (Benefit from) Credit Losses	(238)	538	738
Ending Balance	10,669	10,665	10,723
SFR HELOCs and junior liens \| Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,510	11,771	11,771
Charge-offs	0	0	(29)
ACL on PCD Loans	0
Recoveries	175	285	1,127
Provision for (Benefit from) Credit Losses	158	(977)	(2,359)
Ending Balance	10,843	11,079	10,510
Other \| Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,241	3,260	3,260
Charge-offs	(119)	(193)	(577)
ACL on PCD Loans	0
Recoveries	71	106	361
Provision for (Benefit from) Credit Losses	(26)	(313)	(803)
Ending Balance	$ 2,167	$ 2,860	$ 2,241

Credit Loss, Allowance For Credit Loss

No definition available.

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

- Definition

Credit Loss, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase

+ References

No definition available.

+ Details

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

- Definition

Credit Loss, Allowance For Credit Loss, Recovery

+ References

No definition available.

+ Details

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

- Definition

Credit Loss, Allowance For Credit Loss, Writeoff

+ References

No definition available.

+ Details

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

- Definition

Credit Loss, Expense (Reversal)

+ References

No definition available.

+ Details

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

- Definition

Credit Loss

+ References

No definition available.

+ Details

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

- Definition

Off-Balance Sheet, Credit Loss, Purchased with Credit Deterioration, Increase

+ References

No definition available.

+ Details

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

- Definition

Off Balance Sheet, Credit Loss, Recovery

+ References

No definition available.

+ Details

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

- Definition

Off Balance Sheet, Credit Loss, Writeoff

+ References

No definition available.

+ Details

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

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

+ Details

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

- Definition

Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration.

+ References

+ Details

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

- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

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

- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

+ Details

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

- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446

+ Details

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

- Definition

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tcbk_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tcbk_ConstructionPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tcbk_AgricultureProductionPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=tcbk_CRENonOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=tcbk_CREOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=tcbk_AgricultureLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=tcbk_SFR141stDTLiensMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=tcbk_OtherLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: