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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commitments to Extend Credit [Member]    
Financial instruments whose contract amounts represent credit risk [Abstract]    
Contract or Notional Amount $ 269,672us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommitmentsToExtendCreditMember
$ 264,346us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommitmentsToExtendCreditMember
Letters of Credit [Member]    
Financial instruments whose contract amounts represent credit risk [Abstract]    
Contract or Notional Amount $ 6,524us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_StandbyLettersOfCreditMember
$ 9,505us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_StandbyLettersOfCreditMember
Letters of credit secured by marketable securities (in hundredths) 83.00%msl_PercentageOfLettersOfCreditSecured
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_StandbyLettersOfCreditMember
86.00%msl_PercentageOfLettersOfCreditSecured
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_StandbyLettersOfCreditMember