Business Combinations - Summary of Principal Balance Loans Acquired (Detail) (North Valley Bancorp [Member], USD $) In Thousands, unless otherwise specified	Oct. 03, 2014
Business Acquisition [Line Items]
Undiscounted contractual cash flows	$ 734,437tcbk_UndiscountedContractualCashFlows
Undiscounted cash flows not expected to be collected (nonaccretable difference)	(6,295)
Undiscounted cash flows expected to be collected	728,142
Accretable yield at acquisition	(228,815)
Estimated fair value of loans acquired at acquisition	499,327
Purchase discount	14,798tcbk_PurchaseDiscount
Cost Basis	514,125
PNCI [Member]
Business Acquisition [Line Items]
Undiscounted contractual cash flows	718,731
Undiscounted cash flows expected to be collected	718,731
Accretable yield at acquisition	(228,815)
Estimated fair value of loans acquired at acquisition	489,916
Purchase discount	12,721
Cost Basis	502,637
PCI - Other [Member]
Business Acquisition [Line Items]
Undiscounted contractual cash flows	15,706
Undiscounted cash flows not expected to be collected (nonaccretable difference)	(6,295)
Undiscounted cash flows expected to be collected	9,411
Estimated fair value of loans acquired at acquisition	9,411
Purchase discount	2,077
Cost Basis	$ 11,488

Purchase discount.

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Undiscounted cash flows not expected to be collected.

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- Definition

Undiscounted contractual cash flows.

+ References

No definition available.

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- Definition

Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

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- Definition

The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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For investments which are quantified by principal amount, the principle balance held at close of period.

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