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SUBSEQUENT EVENT (Details) (Subsequent event., Old National Bank, USD $)
In Millions, unless otherwise specified
Jan. 30, 2015
SUBSEQUENT EVENT:  
Purchase of deposits under Branch Purchase and Assumption Agreement $ 120msfg_PurchaseOfDepositsFromBank
Purchase of loans under Branch purchase and Assumption Agreement $ 30msfg_PurchaseOfLoansFromBank
Transactions/savings accounts
  
SUBSEQUENT EVENT:  
Purchase of deposits under Branch Purchase and Assumption Agreement (as a percent) 81.00%msfg_PurchaseOfDepositsFromBankInPercentage
/ us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis
= msfg_OldNationalBankMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_DepositsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Time accounts
  
SUBSEQUENT EVENT:  
Purchase of deposits under Branch Purchase and Assumption Agreement (as a percent) 19.00%msfg_PurchaseOfDepositsFromBankInPercentage
/ us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis
= msfg_OldNationalBankMember
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember