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STOCK PLANS AND STOCK BASED COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Apr. 26, 2007
Jan. 19, 2015
Compensation expense disclosure          
Compensation expense $ 90us-gaap_AllocatedShareBasedCompensationExpense $ 89us-gaap_AllocatedShareBasedCompensationExpense      
Stock options          
Shares          
Outstanding, beginning of year (in shares) 377,790us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
Granted (in shares)   29,389us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
     
Exercised (in shares) (12,350)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
Forfeited or expired (in shares) (35,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
Outstanding at end of year (in shares) 329,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
  377,790us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
   
Exercisable at year end (in shares) 240,888us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
  288,938us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
   
Fully vested and expected to vest(in shares) 323,564us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
Weighted Average Exercise Price          
Outstanding, beginning of year (in dollars per share) $ 13.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
Exercised (in dollars per share) $ 10.07us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
Forfeited or expired (in dollars per share) $ 20.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
Outstanding at end of year (in dollars per share) $ 12.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
  $ 13.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
   
Exercisable at year end (in dollars per share) $ 12.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
  $ 13.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
   
Fully vested and expected to vest (in dollars per share) $ 12.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
Aggregate Intrinsic Value          
Number (in shares) 240,888us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
  288,938us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
   
Weighted average exercise price (in dollars per share) $ 12.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
  $ 13.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
   
Exercisable at year end (in dollars) 1,769us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
  2,219us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
   
Exercisable at year end 4 years   3 years 9 months 18 days    
Compensation expense disclosure          
Compensation expense 43us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
41us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
     
Unrecognized stock option compensation expense related to unvested awards          
April 2015 - December 2015 134msfg_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedRemainderOfFiscalYearEstimatedRecognition
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
2016 93msfg_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedFiscalYearThreeEstimatedRecognition
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
2017 38msfg_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedFiscalYearFourEstimatedRecognition
/ us-gaap_AwardTypeAxis
= msfg_EmployeeAndDirectorsStockOptionsMember
       
Restricted stock          
Compensation expense disclosure          
Granted (in shares) 11,171us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
2007 Plan          
Stock-based compensation          
Number of shares reserved for issuance under the plan       650,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= msfg_StockIncentivePlan2007Member
 
2007 Plan | Restricted stock          
Compensation expense disclosure          
Compensation expense $ 152us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= msfg_StockIncentivePlan2007Member
$ 234us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= msfg_StockIncentivePlan2007Member
     
2015 Plan          
Stock-based compensation          
Number of shares reserved for issuance under the plan         1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= msfg_StockIncentivePlan2015Member