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LOANS, Summary of Loan Portfolio (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loan portfolio [Abstract]    
Total loans $ 1,284,431us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 1,137,554us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Less allowance for loan losses (11,226)us-gaap_LoansAndLeasesReceivableAllowance (8,779)us-gaap_LoansAndLeasesReceivableAllowance
Loans, net 1,273,205us-gaap_LoansAndLeasesReceivableNetReportedAmount 1,128,775us-gaap_LoansAndLeasesReceivableNetReportedAmount
Commercial, Financial and Agricultural [Member]    
Loan portfolio [Abstract]    
Total loans 467,147us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
403,976us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Real Estate - Construction [Member]    
Loan portfolio [Abstract]    
Total loans 68,577us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= msl_RealEstateConstructionMember
82,691us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= msl_RealEstateConstructionMember
Real Estate - Commercial [Member]    
Loan portfolio [Abstract]    
Total loans 467,172us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
397,135us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Real Estate - Residential [Member]    
Loan portfolio [Abstract]    
Total loans 154,602us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
146,841us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Installment Loans to Individuals [Member]    
Loan portfolio [Abstract]    
Total loans 119,328us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= msl_InstallmentLoansToIndividualsMember
97,459us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= msl_InstallmentLoansToIndividualsMember
Lease Financing Receivable [Member]    
Loan portfolio [Abstract]    
Total loans 4,857us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
5,542us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
Other [Member]    
Loan portfolio [Abstract]    
Total loans $ 2,748us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= msl_OtherLoanReceivableMember
$ 3,910us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= msl_OtherLoanReceivableMember