DIVIDENDS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Number of previous years retained profit considered for dividend payment	2 years
Forecasted dividends in 2015
Dividends that could be paid without regulatory approval	7,000

Represents the amount to be earned in the next fiscal year following the latest fiscal year before declaring dividends without approval of regulatory agency.

No definition available.

Name:	msfg_StatutoryAccountingPracticesStatutoryAmountToBeEarnedInNextYearBeforeDeclaringDividendsWithoutRegulatoryApproval
Namespace Prefix:	msfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant