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STOCKHOLDERS' EQUITY (Details) (USD $)
0 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 28, 2012
Jan. 09, 2009
Aug. 31, 2011
Dec. 31, 2009
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2014
Class of Stock [Line Items]              
Funds available to pay dividends to the Parent Company without regulatory approval             21,000,000msl_FundsAvailableToPayDividendsToParentCompanyWithoutRegulatoryApproval
Common Stock [Member]              
Class of Stock [Line Items]              
Stock issued during period (in shares) 756,511us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
           
Series A Preferred Stock [Member]              
Class of Stock [Line Items]              
Stock issued during period (in shares)   20,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Proceeds from issuance of preferred stock   20,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Number of securities called by warrants (in shares)   208,768us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
  104,384us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
     
Exercise price of warrants (in dollars per share)   $ 14.37us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Dividend rate on preferred stock (in hundredths)       5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
     
Stock redeemed during the period (in shares)     20,000us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Stated value (in dollars per share)     $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Series B Preferred Stock [Member]              
Class of Stock [Line Items]              
Stock issued during period (in shares)     32,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Proceeds from issuance of preferred stock used for additional capital     $ 12,000,000msl_ProceedsFromIssuanceOrSaleOfEquityUsedForAdditionalCapital
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Dividend rate on preferred stock (in hundredths)         1.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Target growth rate in qualified small business loans           10.00%msl_TargetGrowthRateInQualifiedSmallBusinessLoans
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
 
Increase in Dividend rate on preferred stock in March 2016 (in hundredth)             9.00%msl_IncreaseInDividendRateOnPreferredStockInMarch2016
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series C Preferred Stock [Member]              
Class of Stock [Line Items]              
Stock issued during period (in shares) 99,971us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
           
Dividend rate on preferred stock (in hundredths)             4.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Conversion price (per share)             18.00msl_ConvertiblePreferredStockConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Company right period to require conversion in trading days             20 days
Company right period to require conversion in consecutive days             30 days
Company right to require conversion above conversion price (in hundredths)             130.00%msl_ConvertiblePreferredStockConversionRequirementsPricePercentageThreshold
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember