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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]      
Securities sold under agreements to repurchase $ 62,098,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 53,916,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase  
Debt to equity threshold evaluation percentage (in hundredths) 30.00%msl_DebtToEquityThresholdEvaluationPercentage 30.00%msl_DebtToEquityThresholdEvaluationPercentage 30.00%msl_DebtToEquityThresholdEvaluationPercentage
Retail Repurchase Agreements [Member]      
Short-term Debt [Line Items]      
Securities sold under agreements to repurchase 49,600,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
41,400,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
 
Average interest rate of outstanding agreements (in hundredths) 0.43%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
0.43%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
 
Securities pledged as collateral 60,900,000us-gaap_SecuritiesHeldAsCollateralAtFairValue
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
51,800,000us-gaap_SecuritiesHeldAsCollateralAtFairValue
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
 
Repurchase Agreement with CitiGroup Global Markets, Inc [Member]      
Short-term Debt [Line Items]      
Securities sold under agreements to repurchase 12,500,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_ShortTermDebtTypeAxis
= msl_RepurchaseAgreementWithCitigroupGlobalMarketsIncMember
12,500,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_ShortTermDebtTypeAxis
= msl_RepurchaseAgreementWithCitigroupGlobalMarketsIncMember
 
Securities pledged as collateral $ 15,700,000us-gaap_SecuritiesHeldAsCollateralAtFairValue
/ us-gaap_ShortTermDebtTypeAxis
= msl_RepurchaseAgreementWithCitigroupGlobalMarketsIncMember
$ 15,700,000us-gaap_SecuritiesHeldAsCollateralAtFairValue
/ us-gaap_ShortTermDebtTypeAxis
= msl_RepurchaseAgreementWithCitigroupGlobalMarketsIncMember
 
Variable rate basis for the first term of the loan 3-month LIBOR 3-month LIBOR  
First term of loan 12 months 12 months  
Fixed interest rate for remainder of term (in hundredths) 4.57%msl_FixedInterestRateOnRepurchaseAgreement
/ us-gaap_ShortTermDebtTypeAxis
= msl_RepurchaseAgreementWithCitigroupGlobalMarketsIncMember
4.57%msl_FixedInterestRateOnRepurchaseAgreement
/ us-gaap_ShortTermDebtTypeAxis
= msl_RepurchaseAgreementWithCitigroupGlobalMarketsIncMember