Consolidated Condensed Statements of Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Reclassification adjustment for realized gains included in net income	$ 339	$ 197
Reclassification adjustment for income tax expense before tax	$ 115	$ 67

Accumulated Other Comprehensive Loss Income Reclassification Adjustments

No definition available.

Name:	mfsf_AccumulatedOtherComprehensiveLossIncomeReclassificationAdjustments
Namespace Prefix:	mfsf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration