Mr. Saner stated, "We are pleased with our second quarter performance given the challenging environment that we are currently facing with the yield curve and the fierce competition for deposits and loans. Our net interest margin has appeared to stabilize, fee income is strong, and our balance sheet growth is solid. Despite a decrease in our mortgage loan portfolio, our total loans have grown at an annualized rate of 5% with the heaviest growth in commercial loans. In addition, our core deposits have grown at an annualized rate of 6% for the first six months of 2007 when excluding the short-term spike in year-end deposits related to public fund tax deposits."

Mr. Saner continued, "We were especially pleased with the improvement in credit quality as this has been a major focus for the Company over the past several quarters. We have been successful in decreasing the non-performing assets to assets ratio during the first two quarters of 2007 to 0.70% of total assets. We are also hopeful this trend will continue throughout 2007. Our focus remains on our strategic initiatives for 2007 including organic loan and deposit growth, improved efficiencies and developing customer relationships."

NET INTEREST INCOME

Net interest income was $18.8 million for the second quarter of 2007, which represents an increase of 14.6% versus the second quarter of 2006. The increase was due primarily to the acquisition activity in 2006, which occurred throughout the second quarter of 2006. Net interest margin, on a fully-taxable equivalent basis, was 3.65% for the second quarter of 2007, down five basis points on a linked quarter basis.

NON-INTEREST INCOME

The Company's non-interest income increased to $7.5 million for the second quarter of 2007 compared to $5.9 million for the same period in 2006. Service charges on deposit accounts increased $1.1 million due primarily to the increase in the number of deposit accounts from the 2006 acquisition activity.

NON-INTEREST EXPENSE

The Company's non-interest expense was $17.1 million for the second quarter of 2007 compared to $14.6 million for the same period in 2006, an increase of 17.1%. Increases in employee costs, occupancy expenses, equipment expenses, and intangibles amortization were primarily attributable to the acquisitions in 2006. The Company's efficiency ratio was 63.9% for the second quarter of 2007, which was equal to the same period a year ago. It is anticipated that the Company's efficiency ratio will improve throughout 2007 as the Company benefits from the integrations of the data processing systems at its Hobart, Indiana affiliate, completed in May 2007, and at its Crawfordsville, Indiana affiliate, scheduled for September 2007. These integrations will allow the Company to better leverage its current operating infrastructure and decrease its data processing expenses in the second half of 2007 and beyond.

ASSET QUALITY

Credit quality improved for the second consecutive quarter. Non-performing assets were $17.2 million as of June 30, 2007, a decrease of $1.2 million from the $18.4 million as of March 31, 2007 and a $3.9 million decrease since the end of the year. Non-performing assets represented 0.70% of total assets as of June 30, 2007 compared to 0.76% as of March 31, 2007 and 0.87% as of December 31, 2006. Annualized net charge-offs for the first six months of 2007 equaled 0.16% of average outstanding loans. The Company's allowance for loan losses as a percent of total outstanding loans was 0.81% as of June 30, 2007.

                        MAINSOURCE FINANCIAL GROUP
                                (unaudited)
               (Dollars in thousands except per share data)

Income Statement      Three months ended June 30  Six months ended June 30
 Summary              --------------------------  ------------------------
                          2007          2006          2007         2006
                      ------------  ------------  -----------  -----------
 Interest Income      $     36,061  $     28,582  $    71,161  $    51,237
 Interest Expense           17,311        12,174       33,804       20,595
                      ------------  ------------  -----------  -----------
 Net Interest Income        18,750        16,408       37,357       30,642
 Provision for Loan
  Losses                       899           363        1,595          723
 Noninterest Income:
  Insurance commissions        512           521          931          941
  Trust and investment
   product fees                447           296          815          589
  Mortgage banking             749           564        1,364        1,144
  Service charges on
   deposit accounts          3,406         2,303        6,076        4,154
  Gain/(losses) on
   sales of securities         190             -          229           61
  Interchange income           846           639        1,587        1,136
  Other                      1,317         1,572        2,556        2,769
                      ------------  ------------  -----------  -----------
   Total Noninterest
    Income                   7,467         5,895       13,558       10,794
 Noninterest Expense:
  Employee                   9,475         8,309       19,164       15,714
  Occupancy                  1,312         1,164        2,738        2,222
  Equipment                  1,525         1,245        2,983        2,379
  Intangible
   amortization                667           469        1,333          890
  Telecommunications           520           440        1,012          887
  Stationary, printing,
   and supplies                379           289          762          524
  Other                      3,219         2,686        5,975        4,387
                      ------------  ------------  -----------  -----------
   Total Noninterest
    Expense                 17,097        14,602       33,967       27,003
 Earnings Before
  Income Taxes               8,221         7,338       15,353       13,710
 Provision for Income
  Taxes                      2,218         1,856        3,935        3,442
                      ------------  ------------  -----------  -----------
 Net Income           $      6,003  $      5,482  $    11,418  $    10,268
                      ============  ============  ===========  ===========

Average Balance       Three months ended June 30  Six months ended June 30
 Sheet Data           --------------------------  ------------------------
                          2007          2006          2007         2006
                      ------------  ------------  -----------  -----------

 Gross Loans          $  1,584,554  $  1,284,394  $ 1,577,124  $ 1,137,498
 Earning Assets          2,121,908     1,779,892    2,107,832    1,637,452
 Total Assets            2,414,111     2,006,436    2,401,827    1,830,224
 Noninterest Bearing
  Deposits                 191,940       162,782      187,483      158,138
 Interest Bearing
  Deposits               1,625,573     1,404,511    1,626,453    1,289,434
 Total Interest
  Bearing Liabilities    1,938,576     1,628,947    1,933,940    1,476,503
 Shareholders' Equity      259,610       197,938      256,597      180,992

Per Share Data        Three months ended June 30  Six months ended June 30
                      --------------------------  ------------------------
                          2007          2006         2007         2006
                      ------------  ------------  -----------  -----------

 Diluted Earnings Per
  Share               $       0.32  $       0.33  $      0.61  $      0.66
 Cash Dividends Per
  Share                      0.140         0.133        0.275        0.262
 Market Value - High         17.50         18.13        17.53        18.52
 Market Value - Low          16.15         15.57        15.42        15.57
 Average Outstanding
  Shares (diluted)      18,750,172    16,574,992   18,753,555   15,501,240


Key Ratios            Three months ended June 30  Six months ended June 30
                      --------------------------  ------------------------
                          2007          2006          2007         2006
                      ------------  ------------  -----------  -----------
  Return on Average
   Assets                     0.98%         1.10%        0.96%        1.13%

  Return on Average
   Equity                     9.14%        11.11%        8.97%       11.44%

  Net Interest Margin         3.65%         3.82%        3.68%        3.92%

  Efficiency Ratio           63.90%        63.86%       65.33%       63.42%

  Net Overhead to
   Average Assets             1.60%         1.74%        1.71%        1.79%

Balance Sheet Highlights
As of June 30             2007          2006
                      ------------  ------------

 Total Loans
  (Excluding Loans
  Held for Sale)      $  1,612,204  $  1,551,661

 Allowance for Loan
  Losses                    13,112        14,426

 Total Securities          489,805       483,735

 Goodwill and
  Intangible Assets        136,657       122,246


 Total Assets            2,452,571     2,375,548

 Noninterest Bearing
  Deposits                 203,638       189,682

 Interest Bearing
  Deposits               1,636,574     1,567,387

 Other Borrowings          333,685       358,734

 Shareholders' Equity      252,626       239,897

Other Balance Sheet Data
As of June 30             2007          2006
                      ------------  ------------

 Book Value Per Share $      13.49  $      12.72

 Loan Loss Reserve to
  Loans                       0.81%         0.93%

 Nonperforming Assets
  to Total Assets             0.70%         0.90%
 Outstanding Shares     18,732,395    18,854,455

Asset Quality
As of June 30             2007          2006
                      ------------  ------------

 Loans Past Due 90
  Days or More and
  Still Accruing      $      1,425  $        528
 Non-accrual Loans          14,432        16,332
 Other Real Estate
  Owned                      1,312         4,606
                      ------------  ------------

 Total Nonperforming
  Assets              $     17,169  $     21,466


 Net Charge-offs -
  YTD                 $      1,275  $      1,102

 Net Charge-offs as a
  % of average loans          0.16%         0.20%

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 $2.5 billion. The Company operates 68 offices in 30 Indiana counties, six offices in three Illinois counties, and six offices in two Ohio counties through its four banking subsidiaries, MainSource Bank, Greensburg, Indiana, MainSource Bank of Illinois, Kankakee, Illinois, MainSource Bank - Crawfordsville, Crawfordsville, Indiana, and MainSource Bank - Ohio, Troy, Ohio. Through its non-banking subsidiaries, MainSource Insurance LLC, and MainSource Title 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. Actual results and experience could differ materially from the anticipated results or other expectations expressed in the Company's forward-looking statements. 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 Company's ability to integrate acquisitions; the impact of our continuing acquisition strategy; and other factors, including various "risk factors" as set forth in our most recent Annual Report on Form 10-K and in other reports we file from time to time with the Securities and Exchange Commission. These reports are available publicly on the SEC website, www.sec.gov, and on the Company's website, www.mainsourcefinancial.com.

CONTACT:
James L. Saner, Sr.
President and CEO
MainSource Financial Group, Inc.
812-663-0157

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