Exhibit 99.1

Filed by TriCo Bancshares pursuant to Rule 425

under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934

Subject Company: North Valley Bancorp.

Commission File No.:0-10652

TRICO BANCSHARES ANNOUNCES QUARTERLY RESULTS

CHICO, Calif. – (April 29, 2014) – TriCo Bancshares (NASDAQ: TCBK) (the “Company”), parent company of Tri Counties Bank, today announced earnings of $7,365,000, or $0.45 per diluted share, for the three months ended March 31, 2014. These results compare to earnings of $8,477,000, or $0.53 per diluted share reported by the Company for the three months ended March 31, 2013.

Total assets of the Company increased $142,751,000 (5.5%) to $2,755,184,000 at March 31, 2014 from $2,612,433,000 at March 31, 2013. Total investments increased $296,854,000 (192%) to $450,955,000 at March 31, 2014 from $154,101,000 at March 31, 2013. Total loans increased $154,690,000 (10.1%) to $1,687,052,000 at March 31, 2014 from $1,532,362,000 at March 31, 2013. Total deposits increased $125,570,000 (5.5%) to $2,411,120,000 at March 31, 2014 from $2,285,550,000 at March 31, 2013.

The following is a summary of the components of the Company’s consolidated net income for the periods indicated:

The following table shows the components of net interest income and net interest margin on a fully tax-equivalent (FTE) basis for the periods indicated:

ANALYSIS OF CHANGE IN NET INTEREST MARGIN ON EARNING ASSETS

(unaudited, dollars in thousands)

Net interest income (FTE) during the first quarter of 2014 increased $1,524,000 (6.2%) from the same period in 2013 to $26,154,000. The increase in net interest income (FTE) was due primarily to a $242,907,000 (147%) increase in the average balance of investments to $407,848,000, and a $122,666,000 (7.9%) increase in the average balance of loans to $1,671,231,000 that were partially offset by a 54 basis point decrease in the average yield on loans from 6.22% during the three months ended March 31, 2013 to 5.68% during the three months ended March 31, 2014. During much of 2013 and the three months ended March 31, 2014, the Company used a portion of its Fed funds sold to buy investments. The increase in average loan balances was due to organic loan growth and the purchase of $62,698,000 of loans during 2013. The decrease in average loan yields was due primarily to declines in market yields on new and renewed loans compared to yields on repricing, maturing, and paid off loans. The increases in average investment and loan balances added $1,780,000 and $1,907,000 to net interest income (FTE) while the decrease in average loan yields reduced net interest income (FTE) by $2,241,000 when compared to the year-ago quarter. During much of 2013 and the three months ended March 31, 2014, the Company deployed some of its excess Federal funds sold into some higher yielding investments while trying to maintain an appropriate level of interest rate risk. Loans acquired through purchase or acquisition of other banks are classified as Purchased Not Credit Impaired (PNCI), Purchased Credit Impaired – cash basis (PCI – cash basis), or Purchased Credit Impaired – other (PCI – other). Loans not acquired in an acquisition or otherwise “purchased” are classified as “originated”. Often, such purchased loans are purchased at a discount to face value, and part of this discount is accreted into (added to) interest income over the remaining life of the loan. Generally, as time goes on, the effect of this discount accretion decreases as these purchased loans mature or payoff early. Further details regarding interest income from loans, including fair value discount accretion, may be found under the heading “Supplemental Loan Interest Income Data” in the Consolidated Financial Data table at the end of this press release.

The Company benefited from a $1,355,000 reversal of provision for loan losses during the three months ended March 31, 2014 versus a benefit of $1,108,000 during the three months ended March 31, 2013. The reversal of provision for loan losses during the first quarter of 2014 was primarily the result of improvements in collateral values and estimated cash flows related to nonperforming originated loans and purchased credit impaired loans, reductions in nonperforming originated loans and purchased credit impaired loans, and decreased loss histories for performing originated loans.

The following table presents the key components of noninterest income for the periods indicated:

Noninterest income decreased $1,923,000 (18.8%) to $8,295,000 in the three months ended March 31, 2014 when compared to the three months ended March 31, 2013. The decrease in noninterest income was due primarily to a $1,830,000 (79.9%) decrease in gain on sale of loans to $464,000, and a $450,000 (14.3%) decrease in service charges on deposit accounts that were partially offset by a $676,000 (123%) increase in gain on sale of foreclosed assets to $1,227,000. The decrease in gain on sale of loans was primarily due to the increase in residential real estate mortgage rates that occurred in May 2013 that resulted in a significant decrease in mortgage refinance activity, and thus a significant decrease in newly originated mortgages for the Company to sell. The decrease in service charges on deposit accounts was primarily due to reduced customer overdrafts and a resulting decrease in non-sufficient funds fees. The increase in gain on sale of foreclosed assets was due to a general increase in property values and sales activity from their lows during the financial crisis that started in 2008.

Salary and benefit expenses increased $342,000 (2.6%) to $13,303,000 during the three months ended March 31, 2014 compared to the three months ended March 31, 2013. Base salaries increased $518,000 (6.2%) to $8,866,000 during the three months ended March 31, 2014 versus the year ago period despite a 1.5% decrease in the average number of full time equivalent employees from 743 to 732. The average number of full time equivalent employees decreased primarily due to the reductions in staff from the closing of five branches since December 31, 2012 that was partially offset by increases in full time equivalent back office staff and management. The salary expense attributable to the newly added back office staff and management outweighed the reduction in salaries from the branch closings. Annual salary merit increases of approximately 2.5% also contributed to the increase in base salary expense. Incentive and commission related salary expenses decreased $163,000 (12.7%) to $1,123,000 during three months ended March 31, 2014 due primarily to decreases in production related incentives tied to reduced residential real estate mortgage loan originations and sales. Benefits expense, including retirement, medical and workers’ compensation insurance, and taxes, decreased $13,000 (0.4%) to $3,314,000 during the three months ended March 31, 2014.

Other noninterest expenses increased $1,374,000 (15.9%) to $10,014,000 during the three months ended March 31, 2014 compared to the three months ended March 31, 2013. The increase in other noninterest expense was due primarily a $303,000 (18.3%) increase in occupancy expense to $1,962,000 that included $238,000 of accelerated depreciation expense of leasehold improvements related to the closing of two branches in the quarter ended March 31, 2014, a $255,000 (58%) reduction in reversal of provision for losses on unfunded commitments to $185,000 from $440,000, a $228,000 (44.8%) increase in professional fees to $739,000 that included $296,000 of legal and consulting fees related to the proposed merger with North Valley Bancorp, a $147,000 (29.6%) increase in ATM network charges to $643,000, and a $100,000 (9.3%) increase in data processing and software expense.

The following table presents the key components of the Company’s noninterest expense for the periods indicated:

On January 21, 2014, the Company and North Valley Bancorp announced that they entered into an Agreement and Plan of Merger and Reorganization under which North Valley will merge with and into the Company, with the Company as the surviving corporation. North Valley Bancorp shareholders will receive a fixed exchange ratio of 0.9433 shares of TriCo Bancshares common stock for each share of North Valley common stock. The merger is expected to be completed in the third quarter of 2014, subject to approval of the merger by shareholders of both companies, receipt of required regulatory and other approvals and satisfaction of customary closing conditions.

In addition to the historical information contained herein, this press release may contain certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The reader of this press release should understand that all such forward-looking statements are subject to various uncertainties and risks that could affect their outcome. The Company’s actual results could differ materially from those suggested by such forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, variances in the actual versus projected growth in assets, return on assets, interest rate fluctuations, economic conditions in the Company’s primary market area, demand for loans, regulatory and accounting changes, loan losses, expenses, rates charged on loans and earned on securities investments, rates paid on deposits, competition effects, fee and other noninterest income earned, whether and when shareholders and regulators approve the Company’s proposed merger with North Valley Bancorp, as well as other factors detailed in the Company’s reports filed with the Securities and Exchange Commission which are incorporated herein by reference, including the Form 10-K for the year ended December 31, 2013. These reports and this entire press release should be read to put such forward-looking statements in context and to gain a more complete understanding of the uncertainties and risks involved in the Company’s business. Any forward-looking statement may turn out to be wrong and cannot be guaranteed. The Company does not intend to update any of the forward-looking statements after the date of this release. Shareholders are urged to read the joint proxy statement/prospectus that will be included in the registration statement on Form S-4, which the Company will file with the SEC in connection the proposed action because it will contain important information about TriCo, North Valley, the merger and related matters, including additional risk and uncertainties

TriCo Bancshares and Tri Counties Bank are headquartered in Chico, California. Tri Counties Bank has a 39-year history in the banking industry. It operates 41 traditional branch locations and 20 in-store branch locations in 23 California counties. Tri Counties Bank offers financial services and provides a diversified line of products and services to consumers and businesses, which include demand, savings and time deposits, consumer finance, online banking, mortgage lending, and commercial banking throughout its market area. It operates a network of 67 ATMs and an automated Customer Service Department, available 24 hours a day, seven days a week. Brokerage services are provided by the Bank’s investment services affiliate, Raymond James Financial Services, Inc. For further information please visit the Tri Counties Bank web site at http://www.tricountiesbank.com.

ADDITIONAL INFORMATION ABOUT THE PROPOSED MERGER TRANSACTION AND WHERE TO FIND IT

Investors and shareholder are urged to carefully review and consider each of TriCo’s and North Valley Bancorp’s public filings with the SEC, including but not limited to their Annual Reports on Form 10-K, their proxy statements, their Current Reports on Form 8-K and their Quarterly Reports on Form 10-Q. The documents filed by TriCo with the SEC may be obtained free of charge at TriCo’s website at www.tricountiesbank.com or at the SEC’s website at www.sec.gov. These documents may also be obtained free of charge from TriCo by requesting them in writing to TriCo, 63 Constitution Drive, Chico, California 95973; Attention: Investor Relations, or by telephone at (530) 898-0300. The documents filed by North Valley with the SEC may be obtained free of charge at North Valley’s website at www.novb.com or at the SEC’s website at www.sec.gov. These documents may also be obtained free of charge from North Valley by requesting them in writing to North Valley Bancorp, 300 Park Marina Circle, Redding, CA 96001, Attention: Corporate Secretary, or by telephone at Phone: (530) 226-2900.

TriCo intends to file a registration statement with the SEC which will include a joint proxy statement of TriCo and North Valley and a prospectus of TriCo, and each party will file other documents regarding the proposed transaction with the SEC. Before making any voting or investment decision, investors and security holders of North Valley and TriCo are urged to carefully read the entire registration statement and joint proxy statement/prospectus, when they become available, as well as any amendments or supplements to these documents, because they will contain important information about the proposed transaction. A definitive joint proxy statement/prospectus will be sent to the shareholders of each company seeking required stockholder approvals. Investors and security holders will be able to obtain the registration statement and the joint proxy statement/prospectus free of charge from the SEC’s website or from TriCo or North Valley by writing to the addresses provided for each company set forth above.

TriCo, North Valley, their directors, executive officers and certain other persons may be deemed to be participants in the solicitation of proxies from TriCo and North Valley shareholders in favor of the approval of the transaction. Information regarding TriCo’s officers and directors will be included in TriCo’s Form 10-K Annual Report to be filed with the SEC, and information regarding North Valley’s officers and directors will be included in North Valley’s Form 10-K Annual Report to be filed with the SEC. Descriptions of the interests of the directors and executive officers of TriCo and North Valley in the proposed merger will be set forth in the proxy statement/prospectus and other relevant documents filed with the SEC (when they become available).

TRICO BANCSHARES—CONSOLIDATED FINANCIAL DATA

(Unaudited. Dollars in thousands, except share data)

TRICO BANCSHARES—CONSOLIDATED FINANCIAL DATA

(Unaudited. Dollars in thousands)