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Credit Quality of Loans and Allowance for Loan Losses, Troubled Debt Restructuring (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Contract
Mar. 31, 2014
Contract
Dec. 31, 2014
Troubled Debt Restructuring [Abstract]      
Current $ 173,000msl_CurrentTroubledDebtRestructuring   $ 176,000msl_CurrentTroubledDebtRestructuring
Past Due Greater than 30 Days 0msl_PastDueGreaterThan30DaysTroubledDebtRestructuring   0msl_PastDueGreaterThan30DaysTroubledDebtRestructuring
Nonaccrual TDRs 234,000msl_NonaccrualTroubledDebtRestructuring   234,000msl_NonaccrualTroubledDebtRestructuring
Total TDRs 407,000us-gaap_FinancingReceivableModificationsRecordedInvestment   410,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Number of TDR defaulted 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1  
Pre-modified contracts identified as TDRs   1msl_FinancingReceivableModificationsPreModificationRecordedInvestmentNumberOfContractsInPeriod  
Pre-modification balance identified as TDR   1,200,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2  
Commercial, Financial and Agricultural [Member]      
Troubled Debt Restructuring [Abstract]      
Current 20,000msl_CurrentTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialLoanMember
  21,000msl_CurrentTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialLoanMember
Past Due Greater than 30 Days 0msl_PastDueGreaterThan30DaysTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialLoanMember
  0msl_PastDueGreaterThan30DaysTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialLoanMember
Nonaccrual TDRs 234,000msl_NonaccrualTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialLoanMember
  234,000msl_NonaccrualTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialLoanMember
Total TDRs 254,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialLoanMember
  255,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialLoanMember
Real Estate - Commercial [Member]      
Troubled Debt Restructuring [Abstract]      
Current 153,000msl_CurrentTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
  155,000msl_CurrentTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
Past Due Greater than 30 Days 0msl_PastDueGreaterThan30DaysTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
  0msl_PastDueGreaterThan30DaysTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
Nonaccrual TDRs 0msl_NonaccrualTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
  0msl_NonaccrualTroubledDebtRestructuring
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
Total TDRs $ 153,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember
  $ 155,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember