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OTHER NON-INTEREST INCOME AND EXPENSE (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
OTHER NON-INTEREST INCOME AND EXPENSE [Abstract]      
Threshold for analysis of noninterest income (in hundredths) 1.00%msl_ThresholdForAnalysisOfNoninterestIncome 1.00%msl_ThresholdForAnalysisOfNoninterestIncome 1.00%msl_ThresholdForAnalysisOfNoninterestIncome
Threshold for analysis of noninterest expense (in hundredths) 1.00%msl_ThresholdForAnalysisOfNoninterestExpense 1.00%msl_ThresholdForAnalysisOfNoninterestExpense 1.00%msl_ThresholdForAnalysisOfNoninterestExpense
Professional fees $ 1,802us-gaap_ProfessionalFees $ 1,709us-gaap_ProfessionalFees $ 2,022us-gaap_ProfessionalFees
FDIC fees 1,050us-gaap_FederalDepositInsuranceCorporationPremiumExpense 1,136us-gaap_FederalDepositInsuranceCorporationPremiumExpense 930us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Marketing expenses 1,658us-gaap_MarketingExpense 2,340us-gaap_MarketingExpense 1,648us-gaap_MarketingExpense
Corporate development expense 1,420us-gaap_BusinessDevelopment 1,507us-gaap_BusinessDevelopment 1,022us-gaap_BusinessDevelopment
Data processing 1,940us-gaap_InformationTechnologyAndDataProcessing 1,955us-gaap_InformationTechnologyAndDataProcessing 1,689us-gaap_InformationTechnologyAndDataProcessing
Printing and supplies 1,114us-gaap_SuppliesExpense 1,494us-gaap_SuppliesExpense 1,105us-gaap_SuppliesExpense
Expenses on other real estate owned and other assets repossessed 691us-gaap_ForeclosedRealEstateExpense 1,201us-gaap_ForeclosedRealEstateExpense 1,767us-gaap_ForeclosedRealEstateExpense
Amortization of intangibles $ 1,106us-gaap_AmortizationOfIntangibleAssets $ 1,106us-gaap_AmortizationOfIntangibleAssets $ 762us-gaap_AmortizationOfIntangibleAssets