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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Servicing Assets      
Servicing fees $ 2,065us-gaap_ServicingFeesNet $ 2,038us-gaap_ServicingFeesNet $ 1,864us-gaap_ServicingFeesNet
Mortgage Banking Derivatives      
Income/(expense) related to derivatives $ 450msfg_GainLossOnInterestRateDerivatives $ (1,675)msfg_GainLossOnInterestRateDerivatives $ 1,740msfg_GainLossOnInterestRateDerivatives
Buildings | Minimum      
Premises and equipment      
Useful lives 30 years    
Buildings | Maximum      
Premises and equipment      
Useful lives 39 years    
Related components | Minimum      
Premises and equipment      
Useful lives 5 years    
Related components | Maximum      
Premises and equipment      
Useful lives 15 years    
Furniture, fixtures and equipment | Minimum      
Premises and equipment      
Useful lives 3 years    
Furniture, fixtures and equipment | Maximum      
Premises and equipment      
Useful lives 10 years