EXHIBIT 99.1

- --------------------------------------------------------------------------------


                                  NEWS RELEASE

        DATE:           June 19, 2006        9:00 a.m. E.S.T.
        CONTACT:        James L. Saner, Sr., President and CEO
                        MainSource Financial Group, Inc.   812-663-0157


- --------------------------------------------------------------------------------


                       MainSource Financial Group Acquires
                       Peoples Ohio Financial Corporation

- --------------------------------------------------------------------------------


MainSource Financial Group, Inc., Greensburg,  Indiana (NASDAQ: MSFG) - James L.
Saner, Sr., President and Chief Executive Officer of MainSource Financial Group,
Inc.  today  announced  the  consummation  of its  acquisition  of Peoples  Ohio
Financial  Corporation and its wholly owned subsidiary,  Peoples Savings Bank of
Troy.  With total assets of  approximately  $200 million,  Peoples  Savings Bank
operates six offices in Miami and Montgomery counties in Ohio.

Mr.  Saner  stated,  "I am pleased to welcome the  employees  and  customers  of
Peoples  Savings  Bank into  MainSource  Financial  Group.  We look  forward  to
continuing  the  philosophy of community  banking and will continue our focus on
local   service   and   access,   local   community   involvement,   and   local
decision-making."

Mr. Saner continued, "This acquisition is very exciting for MainSource Financial
Group  as it is our  first  introduction  in the  State  of  Ohio.  We are  very
impressed with the  communities and markets which Peoples serves and are excited
about bringing additional  products and services to the residents.  In addition,
we are very proud of the  management/employee  team and look  forward to growing
the institution."

Peoples  Savings Bank of Troy changed its name to  MainSource  Bank - Ohio as of
today. New signs as well as the MainSource logo will be prominently displayed at
each location as well as in all future advertising.

Ron Scott, President and CEO of Peoples Savings Bank for the past 16 years, will
continue to serve as Chairman,  President and CEO of MainSource  Bank - Ohio. In
addition,  Anne  Mercer will  continue to serve as Vice  President - Director of
Commercial Lending and Linda Daniel will assume the position of Vice President -
Director of Retail Services.

MainSource Bank - Ohio will continue to maintain a local board of directors. The
directors elected to serve in 2006/2007 are Ron Scott,  William McGraw,  William
Lukens,  Douglas Haines, and Richard Wallace.  In addition,  the board will have
two advisory  directors,  Thom  Robinson and Donald  Cooper.  All of the elected
directors are long-term  residents and business leaders from the areas served by
MainSource Bank - Ohio.

Ron Scott  said,  "We are looking  forward to our  association  with  MainSource
Financial Group and its community  banks.  Our staff,  with their  dedication to
customer service, will remain the same. The bank's name has changed, but not our
dedication to our customers."

"Our new  affiliation  will  allow us to offer  new and  enhanced  products  and
services,  while keeping the same high-level commitment to our customers and our
communities--just as we have for the last 115 years."

Shareholders  of Peoples Ohio  Financial  Corporation  at the time of the merger
were entitled to elect to receive either  0.329764  shares of MainSource  common
stock or $5.59 in cash for each  share of  Peoples  Ohio  Financial  Corporation
stock owned by them. The merger consideration tabulation and calculation process
for election forms  submitted to the exchange agent by  shareholders  of Peoples
Ohio is  substantially  complete,  and the allocation of Peoples Ohio shares for
which no election form has been  submitted is anticipated to be completed in the
week following the merger. Based on the election forms submitted to the exchange
agent, it has been  preliminarily  determined that all Peoples Ohio shareholders
electing to receive  shares of common stock of MainSource  Financial  Group will
receive stock, and while most Peoples Ohio shareholders electing to receive cash
will receive cash, a few Peoples Ohio shareholders electing to receive cash will
receive  either all stock or a combination  of cash and stock.  All Peoples Ohio
shareholders  who did not elect cash or stock or for which no election  form has
been submitted  will receive  shares of MainSource  common stock in exchange for
their Peoples Ohio stock, in accordance with the terms of the Merger  Agreement.
Fractional  shares of MainSource  common stock will not be issued in the merger.
Rather,  Peoples  Ohio  shareholders  will  receive cash in the amount of $16.95
multiplied  by the  fractional  share of  MainSource  common stock to which they
would  otherwise  have  been  entitled.  The  exchange  agent  expects  to  mail
MainSource common stock and cash in exchange for common stock of Peoples Ohio in
accordance  with the terms of the Merger  Agreement  within the next few days to
shareholders  of  People  Ohio who have  completed  proper  election  forms  and
delivered  their  certificates  for Peoples  Ohio common  stock to the  exchange
agent. The exchange agent will hold shares of MainSource  common stock for those
remaining  shareholders  of Peoples Ohio who have not submitted  proper election
forms or delivered their stock certificates for Peoples Ohio common stock to the
exchange agent until such shareholders submit their Peoples Ohio certificates to
the exchange agent or MainSource. The exchange agent will be mailing a letter of
transmittal  in the  coming  weeks to all  non-electing  shareholders  for those
shareholders  to surrender  their Peoples Ohio  certificates  for exchange.  Any
questions regarding the exchange or tabulation process should be directed to the
exchange  agent,  ComputerShare  Trust  Company  of New York at  1-800-245-7630.
MainSource  will issue  approximately  1,817,048  shares of common  stock in the
aggregate and pay approximately  $10,267,242 in cash to the former  shareholders
of Peoples Ohio in the merger.  In addition,  options to acquire an aggregate of
185,064  shares of Peoples Ohio common stock will be  cashed-out  for  aggregate
consideration  of  approximately  $441,000,  and  certain  options to acquire an
aggregate  of 265,150  shares of Peoples Ohio common stock will be amended to be
options to acquire an aggregate of  approximately  87,436  shares of  MainSource
common stock.

MainSource  Financial  Group,  Inc.,  headquartered in Greensburg,  Indiana,  is
listed  on  the  NASDAQ  National  Market  (under  the  symbol:"MSFG")  and is a
community-focused,  financial holding company with assets of approximately  $2.3
billion. The Company operates 66 offices in 29 Indiana counties,  six offices in
three Illinois  counties,  and six offices in two Ohio Counties through its five
banking subsidiaries,  MainSource Bank, Greensburg,  Indiana, MainSource Bank of
Illinois, Kankakee, Illinois, MainSource Bank - Crawfordsville,  Crawfordsville,
Indiana,  MainSource Bank - Hobart, Hobart, Indiana, and MainSource Bank - Ohio,
Troy,  Ohio.  Through its non-banking  subsidiaries,  MainSource  Insurance LLC,
MainSource  Title LLC, and MainSource  Mortgage LLC, the Company and its banking
subsidiaries provide various related financial services.


Forward-Looking Statements

Except for historical information contained herein, the discussion in this press
release may include  certain  forward-looking  statements  based upon management
expectations.  These forward-looking statements involve risks and uncertainties,
including  anticipated  financial  performance,  business  prospects,  and other
similar  matters,  which reflect  management's  best  judgment  based on factors
currently known.  Actual results and experience could differ materially from the
anticipated   results  or  other   expectations   expressed  in  the   Company's
forward-looking  statements  as a result of a number of factors.  Factors  which
could  cause  future  results to differ  from  these  expectations  include  the
following: general economic conditions;  legislative and regulatory initiatives;
monetary and fiscal policies of the federal government; deposit flows; the costs
of  funds;  general  market  rates of  interest;  interest  rates  on  competing
investments; demand for loan products; demand for financial services; changes in
accounting policies or guidelines;  changes in the quality or composition of the
Company's loan and investment portfolios;  the timing and success of integration
efforts at the Company's  recently-acquired banks;  MainSource's expectations or
ability to realize  success  of the  affiliation  with  Peoples  Ohio  Financial
Corporation and the other banks it has recently acquired; and the impact of this
transaction, if successful, on MainSource's business.




                                    * * * * *

 MainSource Financial Group, 201 N. Broadway, P.O. Box 87, Greensburg, IN 47240