Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$ 8,336us-gaap_NetIncomeLoss	$ 7,365us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	1,494	1,463
Amortization of intangible assets	289us-gaap_AmortizationOfIntangibleAssets	52us-gaap_AmortizationOfIntangibleAssets
Provision for (benefit from) loan losses	197	(1,355)
Amortization of investment securities premium, net	719	156
Originations of loans for resale	(24,527)	(13,564)
Proceeds from sale of loans originated for resale	23,130	15,056
Gain on sale of loans	(622)us-gaap_GainLossOnSalesOfLoansNet	(464)us-gaap_GainLossOnSalesOfLoansNet
Change in market value of mortgage servicing rights	506	181
Provision for losses on foreclosed assets	67	36
Gain on sale of foreclosed assets	(311)tcbk_LossGainOnSaleOfForeclosedAssets	(1,227)tcbk_LossGainOnSaleOfForeclosedAssets
Loss on disposal of fixed assets	84us-gaap_GainLossOnDispositionOfAssets	1us-gaap_GainLossOnDispositionOfAssets
Increase in cash value of life insurance	(675)	(397)
Equity compensation vesting expense	324us-gaap_ShareBasedCompensation	296us-gaap_ShareBasedCompensation
Stock option excess tax benefits	(18)	(184)
Change in:
Reserve for unfunded commitments	(130)	(185)
Interest receivable	(519)	(174)
Interest payable	(126)	(73)
Other assets and liabilities, net	4,743	5,303
Net cash from operating activities	12,961	12,286
Investing activities:
Proceeds from maturities of securities available for sale	5,280	7,159
Proceeds from maturities of securities held to maturity	19,474	3,730
Purchases of securities available for sale	(147,335)
Purchases of securities held to maturity	(146,100)	(107,790)
Loan origination and principal collections, net	(40,331)	(14,326)
Improvement of foreclosed assets	(316)tcbk_ImprovementOfForeclosedAssets	(462)tcbk_ImprovementOfForeclosedAssets
Proceeds from sale of other real estate owned	806	5,413
Proceeds from sale of premises and equipment	1	4
Purchases of premises and equipment	(706)	(1,577)
Net cash used by investing activities	(309,227)	(107,849)
Financing activities:
Net (decrease) increase in deposits	(30,935)us-gaap_IncreaseDecreaseInDeposits	637us-gaap_IncreaseDecreaseInDeposits
Net change in other borrowings	(180)	384
Stock option excess tax benefits	18	184
Repurchase of common stock	(27)	(293)
Dividends paid	(2,515)us-gaap_PaymentsOfDividendsCommonStock	(1,772)us-gaap_PaymentsOfDividendsCommonStock
Exercise of stock options	405	306
Net cash used by financing activities	(33,234)	(554)
Net change in cash and cash equivalents	(329,500)	(96,117)
Cash and cash equivalents and beginning of year	610,728	598,368
Cash and cash equivalents at end of year	281,228	502,251
Supplemental disclosure of noncash activities:
Unrealized gain (loss) on securities available for sale	15	(104)
Loans transferred to foreclosed assets	1,244tcbk_LoansTransferredToForeclosedAssets	713tcbk_LoansTransferredToForeclosedAssets
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes	509	2,482
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	1,508us-gaap_InterestPaid	1,160us-gaap_InterestPaid
Cash paid for income taxes	$ 0us-gaap_IncomeTaxesPaid	$ 0us-gaap_IncomeTaxesPaid

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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