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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
item
Operating Segments  
Number of reportable operating segments 1us-gaap_NumberOfReportableSegments
Adoption of New Accounting Standards  
Unrecognized tax positions $ 0us-gaap_UnrecognizedTaxBenefits
Minimum  
Equity  
Stock dividends rate reported by transferring the par value of the stock issued from retained earnings to common stock (as a percent) 20.00%msfg_StockDividendRateReportedByTransferringParValueOfStockIssuedFromRetainedEarningsToCommonStock
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum  
Equity  
Stock dividends rate reported by transferring the fair value, as of the ex-dividend date, of the stock issued from retained earnings to common stock and additional paid-in capital (as a percent) 20.00%msfg_StockDividendRateReportedByTransferringFairValueOfStockIssuedFromRetainedEarningsToCommonStockAndAdditionalPaidInCapital
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Core deposit  
Goodwill and Other Intangible Assets  
Estimated useful lives of other intangible assets 10 years
Other customer relationship intangibles  
Goodwill and Other Intangible Assets  
Estimated useful lives of other intangible assets 10 years