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COMMITMENTS (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Commitments to make loans | Maximum    
Commitments    
Period of commitments to make loans 60 days  
Commitments to extend credit and unused lines of credit at fixed rate    
Commitments    
Financial instruments whose contract amount represents credit risk 33,721us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= msfg_CommitmentsToExtendCreditAndUnusedLinesOfCreditFixedRateMember
$ 16,196us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= msfg_CommitmentsToExtendCreditAndUnusedLinesOfCreditFixedRateMember
Commitments to extend credit and unused lines of credit at variable rate    
Commitments    
Financial instruments whose contract amount represents credit risk 581,843us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= msfg_CommitmentsToExtendCreditAndUnusedLinesOfCreditVariableRateMember
453,500us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= msfg_CommitmentsToExtendCreditAndUnusedLinesOfCreditVariableRateMember
Fixed Rate | Minimum    
Commitments    
Interest rates on commitments (as a percent) 1.67%msfg_LoansAndLeasesReceivableCommitmentsInterestRates
/ us-gaap_FinancialInstrumentAxis
= msfg_CommercialLetterOfCreditFixedRateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maturity period of commitments 1 year  
Fixed Rate | Maximum    
Commitments    
Interest rates on commitments (as a percent) 19.80%msfg_LoansAndLeasesReceivableCommitmentsInterestRates
/ us-gaap_FinancialInstrumentAxis
= msfg_CommercialLetterOfCreditFixedRateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Maturity period of commitments 34 years  
Variable Rate    
Commitments    
Financial instruments whose contract amount represents credit risk 13,286us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= msfg_CommercialLetterOfCreditVariableRateMember
$ 12,318us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= msfg_CommercialLetterOfCreditVariableRateMember