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LOANS AND ALLOWANCE (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Loans and allowance        
Total loans $ 1,969,463us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 1,957,765us-gaap_LoansAndLeasesReceivableGrossCarryingAmount    
Allowance for loan losses (22,638)us-gaap_LoansAndLeasesReceivableAllowance (23,250)us-gaap_LoansAndLeasesReceivableAllowance (27,247)us-gaap_LoansAndLeasesReceivableAllowance (27,609)us-gaap_LoansAndLeasesReceivableAllowance
Net loans 1,946,825us-gaap_LoansAndLeasesReceivableNetReportedAmount 1,934,515us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Financing receivables 173,910us-gaap_NotesReceivableNet      
Commercial and industrial        
Loans and allowance        
Financing receivables 23,050us-gaap_NotesReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
     
Construction and development        
Loans and allowance        
Financing receivables 2,886us-gaap_NotesReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
     
Other real estate        
Loans and allowance        
Financing receivables 96,571us-gaap_NotesReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_RealEstateOtherReceivableMember
     
1-4 family        
Loans and allowance        
Financing receivables 34,536us-gaap_NotesReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_Family1To4Member
     
Home equity        
Loans and allowance        
Financing receivables 15,359us-gaap_NotesReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
     
Direct        
Loans and allowance        
Financing receivables 1,508us-gaap_NotesReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_DirectMember
     
Commercial        
Loans and allowance        
Total loans 333,038us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
322,430us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Allowance for loan losses (3,675)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(2,977)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(3,009)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(3,291)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Carrying amount of credit impaired loans acquired from acquisition 1,000msfg_CarryingAmountOfCreditImpairedLoansAcquiredFromAcquisition
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
     
Commercial | Commercial and industrial        
Loans and allowance        
Total loans 287,524us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
275,646us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial | Agricultural        
Loans and allowance        
Total loans 45,514us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_AgriculturalMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
46,784us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_AgriculturalMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial Real Estate        
Loans and allowance        
Total loans 882,250us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
879,868us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Allowance for loan losses (14,718)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
(15,605)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
(20,439)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
(20,210)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate | Farm        
Loans and allowance        
Total loans 74,172us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
76,849us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Commercial Real Estate | Hotel        
Loans and allowance        
Total loans 62,742us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_HotelReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
74,962us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_HotelReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Commercial Real Estate | Construction and development        
Loans and allowance        
Total loans 75,942us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
61,640us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Commercial Real Estate | Other        
Loans and allowance        
Total loans 669,394us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
666,417us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Residential        
Loans and allowance        
Total loans 708,943us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
709,495us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Allowance for loan losses (3,328)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
(3,501)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
(3,196)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
(3,409)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Residential | 1-4 family        
Loans and allowance        
Total loans 435,667us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_Family1To4Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
435,336us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_Family1To4Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Residential | Home equity        
Loans and allowance        
Total loans 273,276us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
274,159us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Consumer        
Loans and allowance        
Total loans 45,232us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
45,972us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
   
Allowance for loan losses (917)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
(1,167)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
(603)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
(699)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Consumer | Direct        
Loans and allowance        
Total loans 44,675us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_DirectMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
45,360us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_DirectMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
   
Consumer | Indirect        
Loans and allowance        
Total loans $ 557us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_IndirectMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
$ 612us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_IndirectMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember