EXHIBIT 99.1

                             FIRST FINANCIAL BANCORP

                             P R E S S R E L E A S E

    FOR IMMEDIATE RELEASE                                      SEPTEMBER 8, 2004

    Contact Person:
    Leon Zimmerman
    President and CEO
    (209) 367-2000

            FIRST FINANCIAL BANCORP TO JOIN PLACER SIERRA BANCSHARES

Lodi, Calif. (Business Wire) -September 8, 2004- First Financial Bancorp (OTCBB:
"FLLC" - $324.1  million in assets) the parent  company of Bank of Lodi, N.A and
Placer  Sierra  Bancshares,  Sacramento,  California  (NasdaqNM:  "PLSB"  - $1.4
billion in assets)  today  announced  the signing of a definitive  agreement for
Placer  Sierra to acquire  First  Financial  in an all cash deal valued at $50.0
million or $25.40 per share.

Upon completion of the transaction, the combined company will become the largest
community bank in Central  California,  with approximately $1.8 billion in total
assets. The acquired branches will operate under the brand name of Bank of Lodi,
a division of Placer Sierra Bank.

The $50.0  million  purchase  price  represents  227% of tangible book value and
28.2x trailing-four-quarters' earnings.

The  boards of both  companies  approved  the  transaction,  which is subject to
approval by First  Financial's  stockholders,  as well as  regulators  and other
customary conditions of closing. Subject to satisfaction of conditions set forth
in the  Agreement,  it is estimated that the closing of the Merger will occur in
the fourth quarter of 2004.

Ben Goehring,  Chairman of the Board of First Financial Bancorp,  commented, "We
are very pleased to join forces with Placer Sierra  Bancshares.  Given  Placer's
57-year history of providing superior community banking in Northern  California,
this  transaction  will reinforce and  strengthen our strong  community-oriented
philosophy  in the  marketplace.  Our  board of  directors  believes  that  this



transaction  is in the best  interest  of our  shareholders,  and  provides  our
employees  and  community  with an expanded  line of  competitive  products  and
services." First Financial  Bancorp's President and Chief Executive Officer Leon
Zimmerman said, "We are very  enthusiastic  to have identified  Placer Sierra as
our merger partner.  Not only have we achieved an excellent financial result for
our  shareholders,  but we have  found a fine  cultural  fit for our  employees,
customers  and  communities.  We are  confident  that  Placer  Sierra  will be a
friendly  employer for our  dedicated  staff while  continuing  the customer and
community service focus of Bank of Lodi."

First Financial Bancorp used RBC Capital Markets as its financial  adviser,  and
Bingham  McCutchen  served as legal  counsel.  Downey Brand LLP  provided  legal
counsel to Placer Sierra Bancshares.

ABOUT FIRST FINANCIAL BANCORP
First  Financial  Bancorp is the parent of Bank of Lodi,  N.A., a locally  owned
community bank formed in 1982. Bank of Lodi, N.A. offers financial  services via
the web at www.bankoflodi.com,  by phone at 888-265-8577, at any one of its nine
branches  located  in the  communities  of Lodi,  Woodbridge,  Lockeford,  Galt,
Plymouth,  San Andreas, Elk Grove, Folsom, and Sacramento or its loan production
office located in Folsom, California.

ABOUT PLACER SIERRA BANCSHARES
Placer Sierra Bancshares is a  California-based  bank holding company for Placer
Sierra  Bank,  a  California  state-chartered  commercial  bank.  Through its 23
Northern  California  branches,  Placer  Sierra  Bank  serves a five county area
including  Placer,  Sacramento  and El Dorado  counties,  commonly  known as the
greater Sacramento  metropolitan region, and the adjacent counties of Sierra and
Nevada. Through its nine Southern California branches, Placer Sierra Bank serves
both Los Angeles and Orange counties.  Placer Sierra Bank provides its customers
the resources of a large financial institution together with the resourcefulness
and superior  customer service of a community bank.  Placer Sierra Bank offers a
broad array of deposit  products and services for both  commercial  and consumer
customers,  including electronic banking,  cash management services,  electronic
bill payment and investment  services with an emphasis on  relationship  banking
and focus on  generating  low cost  deposits.  In addition,  Placer  Sierra Bank
provides competitive loan products such as commercial loans and lines of credit,



commercial real estate loans, Small Business  Administration loans,  residential
mortgage loans, home equity lines of credit and construction loans.


THIS PRESS  RELEASE  CONTAINS  FORWARD-LOOKING  STATEMENTS  WITH  RESPECT TO THE
FINANCIAL  CONDITION,  RESULTS OF  OPERATION  AND  BUSINESSES  OF PLACER  SIERRA
BANCSHARES  AND FIRST  FINANCIAL  BANCORP  WITHIN  THE  MEANING  OF THE  PRIVATE
SECURITIES  LITIGATION REFORM ACT OF 1995. THESE INCLUDE  STATEMENTS THAT RELATE
TO FUTURE  FINANCIAL  PERFORMANCE  AND  CONDITION,  AND PENDING  MERGERS.  THESE
FORWARD-LOOKING  STATEMENTS  INVOLVE  CERTAIN RISKS AND  UNCERTAINTIES,  MANY OF
WHICH ARE BEYOND THE COMPANY'S CONTROL. FACTORS THAT MAY CAUSE ACTUAL RESULTS TO
DIFFER  MATERIALLY FROM THOSE  CONTEMPLATED BY SUCH  FORWARD-LOOKING  STATEMENTS
INCLUDE,  AMONG OTHERS:  (1) THE RECEIPT OF REGULATORY AND SHAREHOLDER  APPROVAL
FOR THE ACQUISITION;  (2) THE SUCCESS OF PLACER SIERRA BANCSHARES AT INTEGRATING
FIRST FINANCIAL  BANCORP INTO ITS  ORGANIZATION  AND ACHIEVING THE TARGETED COST
SAVINGS;  (3)  DETERIORATION  IN GENERAL ECONOMIC  CONDITIONS,  INTERNATIONALLY,
NATIONALLY OR IN THE STATE OF  CALIFORNIA;  (4) INCREASED  COMPETITIVE  PRESSURE
AMONG FINANCIAL SERVICES COMPANIES; (5) CHANGES IN THE INTEREST RATE ENVIRONMENT
REDUCING  INTEREST  MARGINS OR INCREASING  INTEREST RATE RISK; (6) THE IMPACT OF
TERRORIST  ACTS OR MILITARY  ACTIONS;  AND (7) OTHER  RISKS  DETAILED IN REPORTS
FILED BY PLACER SIERRA  BANCSHARES WITH THE SECURITIES AND EXCHANGE  COMMISSION.
FORWARD-LOOKING  STATEMENTS  SPEAK ONLY AS OF THE DATE THEY ARE MADE, AND PLACER
SIERRA  BANCSHARES  DOES NOT UNDERTAKE TO UPDATE  FORWARD-LOOKING  STATEMENTS TO
REFLECT  CIRCUMSTANCES  OR EVENTS THAT OCCUR AFTER THE DATE THE  FORWARD-LOOKING
STATEMENTS ARE MADE.