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FEDERAL HOME LOAN BANK ADVANCES (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Federal Home Loan Bank advances    
Federal Home Loan Bank advances at year end $ 214,413us-gaap_FederalHomeLoanBankAdvancesLongTerm $ 247,858us-gaap_FederalHomeLoanBankAdvancesLongTerm
Percentage of advances secured by mortgage loans under a blanket security agreement 188.00%msfg_FederalHomeLoanBankAdvancesPercentageOfAdvanceSecuredByFirstMortgageLoansUnderBlanketSecurityAgreement  
Amount of advances contained options to convert the fixed rate advance to an adjustable rate advance 0msfg_FederalHomeLoanBankAdvancesContainedOptionsToConvertFixedRateAdvanceToAdjustableRateAdvanceAmount 0msfg_FederalHomeLoanBankAdvancesContainedOptionsToConvertFixedRateAdvanceToAdjustableRateAdvanceAmount
Required payments over the next five years    
2015 54,832us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate  
2016 14,671us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate  
2017 19,743us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate  
2018 75,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate  
2019 15,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate  
Thereafter 35,167us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate  
Maturities from June 2015 through May 2022, primarily fixed rates from 0.43% to 4.8%, averaging 1.9%    
Federal Home Loan Bank advances    
Federal Home Loan Bank advances at year end 214,413us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_LongtermDebtTypeAxis
= msfg_FederalHomeLoanBankAdvancesFixedRatesFrom0.3PercentTo4.8PercentMaturitiesFromJanuary2014ThroughMay2022Member
 
Minimum fixed interest rate (as a percent) 0.43%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeFrom
/ us-gaap_LongtermDebtTypeAxis
= msfg_FederalHomeLoanBankAdvancesFixedRatesFrom0.3PercentTo4.8PercentMaturitiesFromJanuary2014ThroughMay2022Member
 
Maximum fixed interest rate (as a percent) 4.80%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeTo
/ us-gaap_LongtermDebtTypeAxis
= msfg_FederalHomeLoanBankAdvancesFixedRatesFrom0.3PercentTo4.8PercentMaturitiesFromJanuary2014ThroughMay2022Member
 
Average interest rate (as a percent) 1.90%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= msfg_FederalHomeLoanBankAdvancesFixedRatesFrom0.3PercentTo4.8PercentMaturitiesFromJanuary2014ThroughMay2022Member
 
Maturities from January 2014 through May 2022, primarily fixed rates from 0.3% to 4.8%, averaging 1.3%    
Federal Home Loan Bank advances    
Federal Home Loan Bank advances at year end   $ 247,858us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_LongtermDebtTypeAxis
= msfg_FederalHomeLoanBankAdvancesFixedRatesFrom0.56PercentTo5.9PercentMaturitiesFromApril2013ThroughMay2022Member
Minimum fixed interest rate (as a percent)   0.30%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeFrom
/ us-gaap_LongtermDebtTypeAxis
= msfg_FederalHomeLoanBankAdvancesFixedRatesFrom0.56PercentTo5.9PercentMaturitiesFromApril2013ThroughMay2022Member
Maximum fixed interest rate (as a percent)   4.80%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeTo
/ us-gaap_LongtermDebtTypeAxis
= msfg_FederalHomeLoanBankAdvancesFixedRatesFrom0.56PercentTo5.9PercentMaturitiesFromApril2013ThroughMay2022Member
Average interest rate (as a percent)   1.30%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= msfg_FederalHomeLoanBankAdvancesFixedRatesFrom0.56PercentTo5.9PercentMaturitiesFromApril2013ThroughMay2022Member