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LOANS AND ALLOWANCE (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
item
Dec. 31, 2014
Additional disclosures      
Total of troubled debt restructurings $ 11,586us-gaap_FinancingReceivableModificationsRecordedInvestment   $ 23,325us-gaap_FinancingReceivableModificationsRecordedInvestment
Allocated specific reserves 466msfg_FinancingReceivableModificationsPostModificationAllocatedSpecificReserves   485msfg_FinancingReceivableModificationsPostModificationAllocatedSpecificReserves
Amounts Company has committed to lend to customers with outstanding loans classified as troubled debt restructurings 0msfg_FinancingReceivableModificationsPostModificationAdditionalRecordedInvestment   0msfg_FinancingReceivableModificationsPostModificationAdditionalRecordedInvestment
Number of TDRs 0us-gaap_FinancingReceivableModificationsNumberOfContracts2    
Loans by class modified as troubled debt restructurings      
Number of Loans   2msfg_FinancingReceivableModificationsNumberOfLoans  
Pre-Modification Outstanding Recorded Investment   1,484msfg_FinancingReceivablePreModificationRecordedInvestment  
Loans by class modified as troubled debt restructurings for which there was a payment default within twelve months following the modification      
Period of contractually past due loans under the modified terms, to be considered in payment default 90 days    
Allowance for loan losses increased due to troubled debt restructurings 0msfg_FinancingReceivableModificationsSubsequentPaymentDefaultTroubledDebtRestructuringIncreaseInAllowanceForLoanLosses 0msfg_FinancingReceivableModificationsSubsequentPaymentDefaultTroubledDebtRestructuringIncreaseInAllowanceForLoanLosses  
Charge offs due to troubled debt restructurings 0msfg_FinancingReceivableModificationsSubsequentPaymentDefaultImpairedTroubledDebtRestructuringWriteDown 0msfg_FinancingReceivableModificationsSubsequentPaymentDefaultImpairedTroubledDebtRestructuringWriteDown  
Recorded investment of loans modified other than troubled debt restructurings 151msfg_FinancingReceivableModificationsOtherThanTroubledDebtRestructuringsRecordedInvestment    
Non-accrual      
Additional disclosures      
Total of troubled debt restructurings 545us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember
  575us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember
Performing      
Additional disclosures      
Total of troubled debt restructurings 7,268us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
  7,499us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Commercial Real Estate | Other      
Loans by class modified as troubled debt restructurings      
Number of Loans   1msfg_FinancingReceivableModificationsNumberOfLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
 
Pre-Modification Outstanding Recorded Investment   1,431msfg_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
 
Residential | 1-4 family      
Loans by class modified as troubled debt restructurings      
Number of Loans   1msfg_FinancingReceivableModificationsNumberOfLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_Family1To4Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Pre-Modification Outstanding Recorded Investment   $ 53msfg_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_Family1To4Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember