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INCOME TAX (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Assets    
Allowance for loan losses $ 8,425us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses $ 10,717us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
State net operating loss carryforward 3,708us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 6,357us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Credit carryforwards 9,953us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 9,987us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
OREO write-downs 559msfg_DeferredTaxAssetsOtherRealEstateOwnedWriteDowns 884msfg_DeferredTaxAssetsOtherRealEstateOwnedWriteDowns
Other 2,940us-gaap_DeferredTaxAssetsOther 2,755us-gaap_DeferredTaxAssetsOther
Total assets 25,585us-gaap_DeferredTaxAssetsGross 30,700us-gaap_DeferredTaxAssetsGross
Liabilities    
Depreciation (3,736)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (3,639)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Mortgage servicing rights (1,932)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights (2,046)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights
Unrealized gain on securities AFS (7,065)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome (611)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Intangibles (2,706)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (2,197)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred loan fees/costs (1,691)us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts (1,513)us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts
Other (2,163)us-gaap_DeferredTaxLiabilitiesOther (1,290)us-gaap_DeferredTaxLiabilitiesOther
Total liabilities (19,293)us-gaap_DeferredIncomeTaxLiabilities (11,296)us-gaap_DeferredIncomeTaxLiabilities
Less: Valuation allowance (3,281)us-gaap_DeferredTaxAssetsValuationAllowance (6,030)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset 3,011us-gaap_DeferredTaxAssetsLiabilitiesNet 13,374us-gaap_DeferredTaxAssetsLiabilitiesNet
Operating loss carryforward    
Indiana state operating loss carryforwards 116,426us-gaap_OperatingLossCarryforwards  
Amount for which no deferred income tax liability is recognized 13,112us-gaap_BadDebtReserveForTaxPurposesOfQualifiedLender  
Deferred income tax liability recognized 0msfg_DeferredTaxAssetsLiabilitiesRecognizedForBadDebtReserveForTaxPurposesOfQualifiedLender  
Unrecorded deferred income tax liability 4,589us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityBadDebtReserveForTaxPurposesOfQualifiedLender 4,589us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityBadDebtReserveForTaxPurposesOfQualifiedLender
Interest and penalties    
Interest and penalties recorded in the income statement 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Amount accrued for interest and penalties 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Alternative minimum tax credit carryforwards    
Tax Credit Carryforwards    
Tax credit carryforwards 2,729us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= msfg_AlternativeMinimumTaxCreditCarryforwardsMember		  
General business credit carryforwards    
Tax Credit Carryforwards    
Tax credit carryforwards $ 7,224us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember