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Fair Values of Financial Instruments (Quantitative Information about Unobservable Inputs used in Recurring and Nonrecurring Level Three Fair Value Measurements) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Pooled Trust Preferred Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 2,522us-gaap_AssetsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
$ 2,522us-gaap_AssetsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
Valuation Technique Discounted cash flow Discounted cash flow
Constant prepayment rate 2.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
2.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
Cumulative projected prepayments 40.00%mfsf_FairValueInputsCumulativeProjectedPrepaymentsRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
40.00%mfsf_FairValueInputsCumulativeProjectedPrepaymentsRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
Discount rate 8.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
8.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
Pooled Trust Preferred Securities [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Probability of default 1.70%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
1.70%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Projected cures given deferral 0.00%mfsf_FairValueInputsProjectedCuresRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.00%mfsf_FairValueInputsProjectedCuresRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Loss severity 34.20%mfsf_FairValueInputsLossSeverityRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
34.20%mfsf_FairValueInputsLossSeverityRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Pooled Trust Preferred Securities [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Probability of default 1.80%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
1.80%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Projected cures given deferral 15.00%mfsf_FairValueInputsProjectedCuresRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
15.00%mfsf_FairValueInputsProjectedCuresRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Loss severity 39.80%mfsf_FairValueInputsLossSeverityRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
39.80%mfsf_FairValueInputsLossSeverityRate
/ us-gaap_InvestmentTypeAxis
= mfsf_PooledTrustPreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Other Real Estate Owned/Foreclosed Real Estate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 1,280us-gaap_AssetsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= mfsf_OtherRealEstateAndForeclosureAssetsMember
Valuation Technique   Third party valuations
Other Real Estate Owned/Foreclosed Real Estate [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount to reflect realizable value less estimated selling costs   24.40%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_InvestmentTypeAxis
= mfsf_OtherRealEstateAndForeclosureAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Other Real Estate Owned/Foreclosed Real Estate [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount to reflect realizable value less estimated selling costs   36.70%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_InvestmentTypeAxis
= mfsf_OtherRealEstateAndForeclosureAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember