No definition available.

Name:	invest_InvestmentLineItems
Namespace Prefix:	invest_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Available for sale securities current par amount.

+ References

No definition available.

+ Details

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

- Definition

Available for sale securities original par amount.

+ References

No definition available.

+ Details

Name:	mfsf_AvailableForSaleSecuritiesOriginalParAmount
Namespace Prefix:	mfsf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of recovery estimate depository institutions.

+ References

No definition available.

+ Details

Name:	mfsf_PercentageOfRecoveryEstimateDepositoryInstitutions
Namespace Prefix:	mfsf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of recovery estimate insurance companies.

+ References

No definition available.

+ Details

Name:	mfsf_PercentageOfRecoveryEstimateInsuranceCompanies
Namespace Prefix:	mfsf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage Of Total Investment Portfolio In Unrealized Loss Position Fair Value

+ References

No definition available.

+ Details

Name:	mfsf_PercentageOfTotalInvestmentPortfolioInUnrealizedLossPositionFairValue
Namespace Prefix:	mfsf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CollateralizedDebtObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investment Securities (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
Investment Securities (Narrative) (Details) - USD ($)	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2011
Investment [Line Items]
Fair value of investments reported at less than historical cost	$ 13,968,000		$ 13,968,000		$ 97,566,000
Percentage of Bank portfolio	5.60%		5.60%		37.40%
Proceeds from sales of securities, available for sale	$ 26,000,000	$ 5,800,000	$ 29,901,000	$ 13,383,000
Gross realized gain on sale of securities	701,000	126,000	819,000	366,000
Gross realized losses on sale of securities	49,000	$ 0	$ 49,000	$ 0
Percentage of recovery estimate depository institutions			10.00%
Percentage of recovery estimate insurance companies			15.00%
Pooled Trust Preferred Securities [Member]
Investment [Line Items]
Current par balance	3,800,000		$ 3,800,000
Original Par	$ 4,000,000		$ 4,000,000			$ 4,000,000