2.4.0.81010 - Disclosure - BASIS OF PRESENTATIONtruefalsefalse1false falsefalseD2013Q2YTDhttp://www.sec.gov/CIK0000720002duration2013-01-01T00:00:002013-06-30T00:00:001true 1us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0BASIS OF PRESENTATION2false 2us-gaap_OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-size:10.0pt;font-family:Times New Roman;"> NOTE 1 - BASIS OF PRESENTATION   The significant accounting policies followed by MainSource Financial Group, Inc. (“Company”) for interim financial reporting are consistent with the accounting policies followed for annual financial reporting. The consolidated interim financial statements have been prepared according to accounting principles generally accepted in the United States of America and in accordance with the instructions for Form 10-Q. The interim statements do not include all information and footnotes normally included in the annual financial statements. All adjustments which are, in the opinion of management, necessary for a fair presentation of the results for the periods reported have been included in the accompanying unaudited consolidated financial statements and all such adjustments are of a normal recurring nature. Some items in prior period financial statements were reclassified to conform to current presentation. It is suggested that these consolidated financial statements and notes be read in conjunction with the financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.   Adoption of New Accounting Standards   In July, 2013, the FASB issued Accounting Standards Update 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists.”  U.S. GAAP does not include explicit guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The amendments in this ASU state that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets.This standard applies to all entities that have unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists at the reporting date. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. Early adoption is permitted. The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Retrospective application is permitted.  MSFG has no unrecognized tax positions as of June 30, 2013.  The effect of adopting this standard should not have a material effect on the Company’s operating results or financial condition. </div>falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure for the general note to the financial statements for the reporting entity which may include, descriptions of the basis of presentation, business description, significant accounting policies, consolidations, reclassifications, new pronouncements not yet adopted and changes in accounting principles.No definition available.false0BASIS OF PRESENTATIONfalseBASIS OF PRESENTATIONUnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.mainsourcefinancial.com/role/DisclosureBasisOfPresentation12