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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Net unrealized gain (loss) on securities available-for-sale $ 5,733mfsf_NetUnrealizedGainOnSecuritiesAvailableForSale $ 4,933mfsf_NetUnrealizedGainOnSecuritiesAvailableForSale
Net unrealized loss on securities available-for-sale for which a portion of an other-than-temporary impairment has been recognized in income (917)mfsf_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsAndLossesOnOtherThanTemporarilyImpairedSecuritiesBeforeTax (917)mfsf_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsAndLossesOnOtherThanTemporarilyImpairedSecuritiesBeforeTax
Net unrealized loss on derivative used for cash flow hedges (94)mfsf_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax (109)mfsf_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Net unrealized loss relating to defined benefit plan liability (109)mfsf_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax (109)mfsf_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Accumulated other comprehensive income before tax 4,613mfsf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes 3,798mfsf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
Tax expense 1,700mfsf_AccumulatedOtherComprehensiveIncomeLossTax 1,420mfsf_AccumulatedOtherComprehensiveIncomeLossTax
Net of tax amount $ 2,913us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 2,378us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax