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Loans (Newly Restructured Loans by Type) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Term $ 1,170mfsf_FinancingReceivableTermModifications
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
 
Total modification 1,170us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
 
Commercial [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Combination 134mfsf_FinancingReceivableCombinationModifications
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
 
Total modification 134us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
 
Commercial [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total modification 83us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialAndIndustrialSectorMember
 
Consumer [Member] | First Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Only     
Combination 154mfsf_FinancingReceivableCombinationModifications
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember
394mfsf_FinancingReceivableCombinationModifications
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember
Total modification $ 154us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember
$ 394us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember