Loans - Additional Information (Detail) (USD $)	Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold evaluations currently set	$ 250,000

Impaired Loan Balance that Require Appraisal For Impaired Loan Valuation Procedure

No definition available.

Name:	mfsf_ImpairedLoanBalanceThatRequireAppraisalForImpairedLoanValuationProcedure
Namespace Prefix:	mfsf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant