Noninterest Income and Expense - Components of Other Noninterest Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Income Statement [Abstract]
Service charges on deposit accounts	$ 3,600				$ 2,690
ATM and interchange fees	3,002				2,013
Other service fees	714us-gaap_RevenueOtherFinancialServices				520us-gaap_RevenueOtherFinancialServices
Mortgage banking service fees	534				420
Change in value of mortgage servicing rights	(506)				(181)
Total service charges and fees	7,344us-gaap_FeesAndCommissions				5,462us-gaap_FeesAndCommissions
Gain on sale of loans	622us-gaap_GainLossOnSalesOfLoansNet				464us-gaap_GainLossOnSalesOfLoansNet
Commissions on sale of non-deposit investment products	965				771
Increase in cash value of life insurance	675us-gaap_BankOwnedLifeInsuranceIncome				397us-gaap_BankOwnedLifeInsuranceIncome
Change in indemnification asset	(65)tcbk_ChangeInIndemnificationAsset				(412)tcbk_ChangeInIndemnificationAsset
Gain on sale of foreclosed assets	311tcbk_LossGainOnSaleOfForeclosedAssets				1,227tcbk_LossGainOnSaleOfForeclosedAssets
Sale of customer checks	128tcbk_SaleOfCustomerChecks				101tcbk_SaleOfCustomerChecks
Lease brokerage income	137us-gaap_BrokerageCommissionsRevenue				107us-gaap_BrokerageCommissionsRevenue
Loss on disposal of fixed assets	(84)us-gaap_GainLossOnDispositionOfAssets				(1)us-gaap_GainLossOnDispositionOfAssets
Other	147tcbk_OperatingInterestIncomeOther				179tcbk_OperatingInterestIncomeOther
Total other noninterest income	2,836us-gaap_NoninterestIncomeOther				2,833us-gaap_NoninterestIncomeOther
Total noninterest income	$ 10,180us-gaap_NoninterestIncome	$ 9,755us-gaap_NoninterestIncome	$ 8,589us-gaap_NoninterestIncome	$ 7,877us-gaap_NoninterestIncome	$ 8,295us-gaap_NoninterestIncome

Change in indemnification asset.

No definition available.

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- Definition

Change in market value of mortgage servicing rights.

+ References

No definition available.

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- Definition

Commissions on sale of non-deposit investment products.

+ References

No definition available.

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- Definition

Loss (gain) on sale of foreclosed assets.

+ References

No definition available.

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- Definition

Operating interest income other.

+ References

No definition available.

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- Definition

Sale of customer checks.

+ References

No definition available.

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- Definition

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

+ References

+ Details

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- Definition

Amount of commission revenue from buying and selling securities on behalf of customers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

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-Paragraph 1

-Subparagraph (SX 210.9-04.13(a),(b))

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- Definition

Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions.

+ References

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-Publisher FASB

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-Subparagraph (SX 210.9-04.13)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Article 9

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- Definition

Amount of income earned from credit card services (including late, over limit, and annual fees) and debit card services (including interchange fees, annual fees and other fees). Excludes interest income earned on credit card balances and transactions.

+ References

No definition available.

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- Definition

Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Article 9

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-Subparagraph (SX 210.9-04.13 (d))

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- Definition

Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans.

+ References

No definition available.

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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- Definition

The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

+ References

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-Subparagraph (SX 210.7-04.3(a))

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- Definition

The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

+ References

+ Details

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- Definition

Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.

+ References

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- Definition

Fees and other service revenues recognized in the period that are not otherwise specified in the taxonomy.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

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