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INCOME TAX (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income tax expense      
Currently payable $ 4,578us-gaap_CurrentIncomeTaxExpenseBenefit $ 3,616us-gaap_CurrentIncomeTaxExpenseBenefit $ 4,419us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred 5,950us-gaap_DeferredIncomeTaxExpenseBenefit 1,589us-gaap_DeferredIncomeTaxExpenseBenefit 1,731us-gaap_DeferredIncomeTaxExpenseBenefit
Change in valuation allowance (2,749)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 114us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (123)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Total income tax expense 7,779us-gaap_IncomeTaxExpenseBenefit 5,319us-gaap_IncomeTaxExpenseBenefit 6,027us-gaap_IncomeTaxExpenseBenefit
Differences between effective tax rates and the federal statutory rate applied to income before income taxes      
Federal statutory income tax rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Federal statutory income tax 12,871us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 11,082us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 11,650us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax exempt interest (4,425)msfg_IncomeTaxReconciliationTaxExemptInterest (4,529)msfg_IncomeTaxReconciliationTaxExemptInterest (4,527)msfg_IncomeTaxReconciliationTaxExemptInterest
Effect of state income taxes 3,199us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 111us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 192us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Non-deductible expenses 338us-gaap_IncomeTaxReconciliationNondeductibleExpense 504us-gaap_IncomeTaxReconciliationNondeductibleExpense 349us-gaap_IncomeTaxReconciliationNondeductibleExpense
Tax exempt income on life insurance (454)msfg_IncomeTaxReconciliationTaxExemptIncomeOnLifeInsurance (482)msfg_IncomeTaxReconciliationTaxExemptIncomeOnLifeInsurance (422)msfg_IncomeTaxReconciliationTaxExemptIncomeOnLifeInsurance
Tax credits (369)us-gaap_IncomeTaxReconciliationTaxCredits (757)us-gaap_IncomeTaxReconciliationTaxCredits (861)us-gaap_IncomeTaxReconciliationTaxCredits
Change in valuation allowance (2,749)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 114us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (123)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Captive insurance premiums (371)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance (91)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance  
Other (261)us-gaap_IncomeTaxReconciliationOtherAdjustments (633)us-gaap_IncomeTaxReconciliationOtherAdjustments (231)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense $ 7,779us-gaap_IncomeTaxExpenseBenefit $ 5,319us-gaap_IncomeTaxExpenseBenefit $ 6,027us-gaap_IncomeTaxExpenseBenefit