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Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.No definition available.false2Other real estate owned/assets held for sale40true 5us-gaap_OtherRealEstateAndForeclosedAssetsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Breakdown of properties by portfolio class41false 6msfg_OtherRealEstateAndForeclosedAssetsNetmsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse327000327USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse327000327USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse803000803USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of other real estate and foreclosed assets after valuation allowance. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.No definition available.true2Other real estate owned/assets held for sale42false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse14false USDtruefalse$I2013Q2_FairValueMeasurementsNonrecurringMember_CommercialRealEstateOtherReceivableMemberhttp://www.sec.gov/CIK0000720002instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseNon-recurring basisus-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsNonrecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberfalsefalseOther commercial real estateus-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialRealEstateOtherReceivableMemberus-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Other commercial real estate43true 4us-gaap_AssetsFairValueDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Assets:44false 5msfg_ImpairedFinancingReceivableFairValueDisclosuremsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse63730006373USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse63730006373USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe fair value related to impaired financing receivables.No definition available.true2Total impaired loans45false 5msfg_OtherRealEstateAndForeclosedAssetsNetmsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse327000327USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse327000327USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of other real estate and foreclosed assets after valuation allowance. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.No definition available.false2Other real estate owned/assets held for sale46false 5msfg_ImpairedFinancingReceivableGrossCarryingAmountmsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse74120007412USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse74120007412USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryGross carrying amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.No definition available.false2Gross carrying amount of impaired loans47false 5msfg_ImpairedFinancingReceivableValuationAllowancemsfg_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10390001039USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse10390001039USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of valuation allowance for credit losses related to gross carrying value.No definition available.false2Valuation allowance of impaired loans48true 5us-gaap_OtherRealEstateAndForeclosedAssetsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Breakdown of properties by portfolio class49false 6msfg_OtherRealEstateAndForeclosedAssetsGrossmsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse482000482USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse482000482USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryGross carrying amount as of the balance sheet date of other real estate and foreclosed assets before valuation allowance. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.No definition available.false2Gross outstanding balance of other real estate owned/assets held for sale50false 6msfg_RealEstateOwnedValuationAllowanceAdjustmentmsfg_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse155000155USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse155000155USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryBalances at end of period in the valuation allowance as adjusted.No definition available.false2Valuation allowance of other real estate owned/assets held for sale51false 6msfg_OtherRealEstateAndForeclosedAssetsNetmsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse327000327USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse327000327USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of other real estate and foreclosed assets after valuation allowance. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.No definition available.true2Other real estate owned/assets held for sale52false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse15false USDtruefalse$I2013Q2_Family1To4Member_FairValueMeasurementsNonrecurringMemberhttp://www.sec.gov/CIK0000720002instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseNon-recurring basisus-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsNonrecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberfalsefalse1-4 familyus-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxisxbrldihttp://xbrl.org/2006/xbrldimsfg_Family1To4Memberus-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse01-4 family53true 4us-gaap_AssetsFairValueDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Assets:54false 5msfg_OtherRealEstateAndForeclosedAssetsNetmsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse9500095USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse9500095USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse9500095USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of other real estate and foreclosed assets after valuation allowance. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate and premises that are no longer used in operations may also be included in real estate owned. 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Other real estate may include real estate investments, real estate loans that qualify as investments in real estate and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.No definition available.false2Gross outstanding balance of other real estate owned/assets held for sale57false 6msfg_RealEstateOwnedValuationAllowanceAdjustmentmsfg_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse6300063USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse6300063USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryBalances at end of period in the valuation allowance as adjusted.No definition available.false2Valuation allowance of other real estate owned/assets held for sale58false 6msfg_OtherRealEstateAndForeclosedAssetsNetmsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse9500095USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse9500095USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse9500095USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of other real estate and foreclosed assets after valuation allowance. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.No definition available.true2Other real estate owned/assets held for sale59false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse17false USDtruefalse$I2013Q2_FairValueInputsLevel3Member_FairValueMeasurementsNonrecurringMemberhttp://www.sec.gov/CIK0000720002instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseNon-recurring basisus-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsNonrecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberfalsefalseSignificant Unobservable Inputs (Level 3)us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Significant Unobservable Inputs (Level 3)60true 4us-gaap_AssetsFairValueDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Assets:61false 5msfg_ImpairedFinancingReceivableFairValueDisclosuremsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse68290006829USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse68290006829USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse59750005975USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe fair value related to impaired financing receivables.No definition available.true2Total impaired loans62false 5us-gaap_ServicingAssetAtFairValueAmountus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse25690002569USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse25690002569USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse29420002942USD$falsefalsefalsexbrli:monetaryItemTypemonetaryFair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 13A, 13B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph f(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B9 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Impaired servicing rights63false 5msfg_OtherRealEstateAndForeclosedAssetsNetmsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10400001040USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse10400001040USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse26620002662USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of other real estate and foreclosed assets after valuation allowance. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.No definition available.false2Other real estate owned/assets held for sale64true 5us-gaap_OtherRealEstateAndForeclosedAssetsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Breakdown of properties by portfolio class65false 6msfg_OtherRealEstateAndForeclosedAssetsNetmsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse10400001040USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse10400001040USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse26620002662USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of other real estate and foreclosed assets after valuation allowance. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.No definition available.true2Other real estate owned/assets held for sale66false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse19false USDtruefalse$I2013Q2_CommercialAndIndustrialLoanMember_FairValueInputsLevel3Member_FairValueMeasurementsNonrecurringMemberhttp://www.sec.gov/CIK0000720002instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseNon-recurring basisus-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsNonrecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberfalsefalseSignificant Unobservable Inputs (Level 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basisus-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsNonrecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberfalsefalseSignificant Unobservable Inputs (Level 3)us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseFarmus-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxisxbrldihttp://xbrl.org/2006/xbrldimsfg_FarmReceivableMemberus-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Significant Unobservable Inputs (Level 3) | Farm70true 4us-gaap_AssetsFairValueDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Assets:71false 5msfg_ImpairedFinancingReceivableFairValueDisclosuremsfg_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse5400054USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse5400054USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse480000480USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe fair value related to impaired financing receivables.No definition available.true2Total impaired loans72false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse23false USDtruefalse$I2013Q2_ConstructionAndDevelopmentReceivableMember_FairValueInputsLevel3Member_FairValueMeasurementsNonrecurringMemberhttp://www.sec.gov/CIK0000720002instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseNon-recurring basisus-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsNonrecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberfalsefalseSignificant Unobservable Inputs (Level 3)us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseConstruction and 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