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FAIR VALUE (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
FAIR VALUE.    
Number of times a sample of prices supplied by the pricing agent is validated by comparison to prices obtained from other third party sources 2msfg_NumberOfTimesInAYearSampleOfPricesSuppliedByPricingAgentIsValidatedByComparisonFromOtherThirdPartySources  
Servicing Rights    
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value    
PSA (as a percent) 190.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= msfg_ServicingRightMember
174.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= msfg_ServicingRightMember
Discount rate (as a percent) 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= msfg_ServicingRightMember
10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= msfg_ServicingRightMember
Minimum | Impaired Loans    
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value    
Adjustments for differences between the comparable sales and income (as a percent) 0.00%us-gaap_FairValueInputsComparabilityAdjustments
/ us-gaap_FairValueByAssetClassAxis
= msfg_ImpairedFinancingReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Minimum | Other real estate owned    
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value    
Adjustments for differences between the comparable sales and income (as a percent) 0.00%us-gaap_FairValueInputsComparabilityAdjustments
/ us-gaap_FairValueByAssetClassAxis
= msfg_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum | Impaired Loans    
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value    
Adjustments for differences between the comparable sales and income (as a percent) 50.00%us-gaap_FairValueInputsComparabilityAdjustments
/ us-gaap_FairValueByAssetClassAxis
= msfg_ImpairedFinancingReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Maximum | Other real estate owned    
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value    
Adjustments for differences between the comparable sales and income (as a percent) 50.00%us-gaap_FairValueInputsComparabilityAdjustments
/ us-gaap_FairValueByAssetClassAxis
= msfg_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember