BRANCH CLOSURES (Details) (USD $) In Millions, unless otherwise specified		0 Months Ended
Dec. 31, 2013	Jan. 31, 2014 Forecast item
Branch closures
Number of branch offices whose closure is approved by the board of directors		3
Deposits of branch offices to be closed	$ 20

Represents the number of branch offices of the entity, whose closure was approved by the board of directors.

No definition available.

Name:	msfg_BankBranchClosureApprovedByBoardNumberOfOffices
Namespace Prefix:	msfg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration