XML 23 R37.htm IDEA: XBRL DOCUMENT v2.4.1.9
LOANS AND ALLOWANCE (Details 6) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Risk category of loans    
Loans 1,969,463,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 1,957,765,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Pass    
Risk category of loans    
Loans 1,025,172,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 995,989,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention    
Risk category of loans    
Loans 30,823,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 34,922,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Performing    
Risk category of loans    
Loans 140,530,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 143,086,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Non-accrual    
Risk category of loans    
Loans 3,543,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember		 3,278,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember
Watch    
Risk category of loans    
Loans 87,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= msfg_WatchMember		 231,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= msfg_WatchMember
Substandard    
Risk category of loans    
Loans 13,069,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 22,927,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard Commercial    
Risk category of loans    
Loans 2,064,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= msfg_SubstandardCommercialMember		 1,865,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= msfg_SubstandardCommercialMember
Minimum    
Risk category of loans    
Credit relationships with an outstanding balance 1,000,000msfg_FinancingReceivableCreditQualityRelationshipsIndicatorOutstandingBalance
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Minimum | Watch    
Risk category of loans    
Period of loans past due 60 days  
Minimum | Substandard    
Risk category of loans    
Period of loans past due 90 days  
Minimum | Loss    
Risk category of loans    
Period of loans past due 119 days  
Maximum | Watch    
Risk category of loans    
Period of loans past due 89 days  
Consumer loans not secured by 1-4 family residential real estate | Minimum | Substandard    
Risk category of loans    
Period of loans past due 60 days  
Consumer loans not secured by 1-4 family residential real estate | Maximum | Substandard    
Risk category of loans    
Period of loans past due 119 days  
Commercial    
Risk category of loans    
Loans 333,038,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 322,430,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial | Maximum    
Risk category of loans    
Loans classified by delinquency 250,000msfg_LoansAndLeasesReceivableClassifiedByDelinquency
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Commercial | Commercial and industrial    
Risk category of loans    
Loans 287,524,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 275,646,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial | Commercial and industrial | Pass    
Risk category of loans    
Loans 236,930,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 226,731,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial | Commercial and industrial | Special Mention    
Risk category of loans    
Loans 11,505,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 9,926,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial | Commercial and industrial | Performing    
Risk category of loans    
Loans 35,542,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 36,839,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Commercial | Commercial and industrial | Non-accrual    
Risk category of loans    
Loans 630,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember		 35,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember
Commercial | Commercial and industrial | Watch    
Risk category of loans    
Loans   75,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= msfg_WatchMember
Commercial | Commercial and industrial | Substandard    
Risk category of loans    
Loans 2,485,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 1,596,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial | Commercial and industrial | Substandard Commercial    
Risk category of loans    
Loans 432,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= msfg_SubstandardCommercialMember		 444,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_CommercialAndIndustrialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= msfg_SubstandardCommercialMember
Commercial | Agricultural    
Risk category of loans    
Loans 45,514,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_AgriculturalMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 46,784,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_AgriculturalMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial | Agricultural | Pass    
Risk category of loans    
Loans 45,514,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_AgriculturalMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 46,634,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_AgriculturalMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial | Agricultural | Non-accrual    
Risk category of loans    
Loans   150,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_AgriculturalMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember
Commercial Real Estate    
Risk category of loans    
Loans 882,250,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 879,868,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate | Maximum    
Risk category of loans    
Loans classified by delinquency 250,000msfg_LoansAndLeasesReceivableClassifiedByDelinquency
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Commercial Real Estate | Farm    
Risk category of loans    
Loans 74,172,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 76,849,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate | Farm | Pass    
Risk category of loans    
Loans 73,221,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 75,191,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate | Farm | Special Mention    
Risk category of loans    
Loans 269,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 966,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial Real Estate | Farm | Non-accrual    
Risk category of loans    
Loans 682,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember		 692,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_FarmReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember
Commercial Real Estate | Hotel    
Risk category of loans    
Loans 62,742,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_HotelReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 74,962,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_HotelReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate | Hotel | Pass    
Risk category of loans    
Loans 59,955,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_HotelReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 60,704,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_HotelReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate | Hotel | Special Mention    
Risk category of loans    
Loans 2,787,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_HotelReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 2,835,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_HotelReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial Real Estate | Hotel | Substandard    
Risk category of loans    
Loans   11,423,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_HotelReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial Real Estate | Construction and development    
Risk category of loans    
Loans 75,942,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 61,640,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate | Construction and development | Pass    
Risk category of loans    
Loans 75,942,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 60,971,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate | Construction and development | Special Mention    
Risk category of loans    
Loans   372,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial Real Estate | Construction and development | Non-accrual    
Risk category of loans    
Loans   78,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= msfg_NonAccrualMember
Commercial Real Estate | Construction and development | Substandard    
Risk category of loans    
Loans   219,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_ConstructionAndDevelopmentReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial Real Estate | Other    
Risk category of loans    
Loans 669,394,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 666,417,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate | Other | Pass    
Risk category of loans    
Loans 533,610,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 525,758,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate | Other | Special Mention    
Risk category of loans    
Loans 16,262,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 20,823,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= msfg_OtherReceivableMember
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Commercial Real Estate | Other | Performing    
Risk category of loans    
Loans 104,988,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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= us-gaap_PerformingFinancingReceivableMember
Commercial Real Estate | Other | Non-accrual    
Risk category of loans    
Loans 2,231,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Commercial Real Estate | Other | Watch    
Risk category of loans    
Loans 87,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Commercial Real Estate | Other | Substandard    
Risk category of loans    
Loans 10,584,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Commercial Real Estate | Other | Substandard Commercial    
Risk category of loans    
Loans 1,632,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Residential    
Risk category of loans    
Loans 708,943,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Residential | Performing    
Risk category of loans    
Loans 703,540,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Residential | Watch    
Risk category of loans    
Loans 1,010,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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/ us-gaap_InternalCreditAssessmentAxis
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Residential | Substandard Commercial    
Risk category of loans    
Loans 4,393,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Residential | 1-4 family    
Risk category of loans    
Loans 435,667,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Residential | 1-4 family | Performing    
Risk category of loans    
Loans 432,044,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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/ us-gaap_InternalCreditAssessmentAxis
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Residential | 1-4 family | Watch    
Risk category of loans    
Loans 696,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Residential | 1-4 family | Substandard Commercial    
Risk category of loans    
Loans 2,927,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Residential | Home equity    
Risk category of loans    
Loans 273,276,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Residential | Home equity | Performing    
Risk category of loans    
Loans 271,496,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Residential | Home equity | Watch    
Risk category of loans    
Loans 314,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Residential | Home equity | Substandard Commercial    
Risk category of loans    
Loans 1,466,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer    
Risk category of loans    
Loans 45,232,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Performing    
Risk category of loans    
Loans 45,071,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Substandard    
Risk category of loans    
Loans 24,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Loss    
Risk category of loans    
Loans 137,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Direct    
Risk category of loans    
Loans 44,675,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Direct | Performing    
Risk category of loans    
Loans 44,516,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Direct | Substandard    
Risk category of loans    
Loans 22,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Direct | Loss    
Risk category of loans    
Loans 137,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Indirect    
Risk category of loans    
Loans 557,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Indirect | Performing    
Risk category of loans    
Loans 555,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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Consumer | Indirect | Substandard    
Risk category of loans    
Loans 2,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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