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Fair Values of Financial Instruments (Estimated Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Assets, carrying amount        
Cash and cash equivalents $ 18,667us-gaap_CashAndCashEquivalentsAtCarryingValue $ 29,575us-gaap_CashAndCashEquivalentsAtCarryingValue $ 22,122us-gaap_CashAndCashEquivalentsAtCarryingValue $ 25,285us-gaap_CashAndCashEquivalentsAtCarryingValue
FHLB stock, carrying amount 11,964us-gaap_FederalHomeLoanBankStock 11,964us-gaap_FederalHomeLoanBankStock    
Interest receivable, carrying amount 3,656us-gaap_InterestReceivable 3,730us-gaap_InterestReceivable    
Loans held for sale, carrying amount 10,771us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup 6,140us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup    
Loans net, carrying amount 1,010,390us-gaap_LoansAndLeasesReceivableNetReportedAmount 1,003,518us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Liabilities, carrying amount        
Deposits, carrying amount 1,086,125us-gaap_Deposits 1,079,320us-gaap_Deposits    
FHLB advances, carrying amount 187,542us-gaap_FederalHomeLoanBankAdvancesLongTerm 192,442us-gaap_FederalHomeLoanBankAdvancesLongTerm    
Other borrowings, carrying amount 9,995us-gaap_OtherBorrowings 10,174us-gaap_OtherBorrowings    
Interest payable, carrying amount 247us-gaap_InterestPayableCurrentAndNoncurrent 223us-gaap_InterestPayableCurrentAndNoncurrent    
Assets        
Cash and cash equivalents 18,667us-gaap_CashAndCashEquivalentsFairValueDisclosure 29,575us-gaap_CashAndCashEquivalentsFairValueDisclosure    
FHLB stock, fair value 11,964us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure 11,964us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure    
Interest receivable, fair value 3,656mfsf_InterestReceivableFairValueDisclosure 3,730mfsf_InterestReceivableFairValueDisclosure    
Loans held for sale, fair value 10,888us-gaap_LoansHeldForSaleFairValueDisclosure 6,220us-gaap_LoansHeldForSaleFairValueDisclosure    
Loans, fair value 1,017,968us-gaap_LoansReceivableFairValueDisclosure 1,006,233us-gaap_LoansReceivableFairValueDisclosure    
Liabilities, fair value        
Deposits, fair value 1,087,595us-gaap_DepositsFairValueDisclosure 1,050,295us-gaap_DepositsFairValueDisclosure    
FHLB advances, fair value 188,031us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure 191,995us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure    
Other borrowings, fair value 10,090us-gaap_OtherLiabilitiesFairValueDisclosure 10,283us-gaap_OtherLiabilitiesFairValueDisclosure    
Interest payable, fair value 247mfsf_InterestPayableFairValueDisclosure 223mfsf_InterestPayableFairValueDisclosure    
Fair Value, Inputs, Level 1        
Assets        
Cash and cash equivalents 18,667us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
29,575us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Liabilities, fair value        
Deposits, fair value 696,191us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
648,314us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Fair Value, Inputs, Level 2        
Assets        
FHLB stock, fair value 11,964us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
11,964us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Interest receivable, fair value 3,656mfsf_InterestReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
3,730mfsf_InterestReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Loans held for sale, fair value 10,888us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
6,220us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Liabilities, fair value        
FHLB advances, fair value 188,031us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
191,995us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Other borrowings, fair value 10,090us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
10,283us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Interest payable, fair value 247mfsf_InterestPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
223mfsf_InterestPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Fair Value, Inputs, Level 3        
Assets        
Loans, fair value 1,017,968us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1,006,233us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Liabilities, fair value        
Deposits, fair value $ 391,404us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 401,981us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member