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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Grade
Loans [Abstract]  
Amount of non-major homogenous loan, maximum $ 250,000msl_AmountOfNonMajorHomogenousLoanMaximum
Number of days past due for loan to be placed on nonaccrual status 90 days
Period of repayment performance for nonaccrual loan to be returned to accrual status, lower range limit 6 months
Period of repayment performance for nonaccrual loan to be returned to accrual status, upper range limit 1 year
Credit Risk Rating [Abstract]  
Number of risk rating grades 3msl_NumberOfRiskRatingGrades
Allowance for Loan Losses [Abstract]  
Period of historical loss experience in determining general reserves, minimum 12 months
Period of historical loss experience in determining general reserves, maximum 18 months
Basic and Diluted Earnings Per Common Share [Abstract]  
Percentage of issued shares on which small stock dividend is declared, maximum (in hundredths) 25.00%msl_PercentageOfIssuedSharesOnWhichSmallStockDividendIsDeclaredMaximum
Statements of Cash Flows [Abstract]  
Period over which federal funds are sold 1 day
Core Deposits [Member] | Straight-Line Basis [Member]  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life 15 years
Core Deposits [Member] | Accelerated Basis [Member]  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life 10 years
Buildings and Improvements [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 10 years
Buildings and Improvements [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 40 years
Furniture, Fixtures, and Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Furniture, Fixtures, and Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 10 years
Automobiles [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Automobiles [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years