Percentage Of Defined Benefit Plan Contributions By Plan Participants

No definition available.

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Namespace Prefix:	mfsf_
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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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

- Details

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Balance Type:	na
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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of plan compensation cost recognized during the period.

+ References

+ Details

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

- Definition

Shares contributed to the ESOP that have not yet been released, committed to be released, or allocated to participant accounts. Suspense shares generally collateralize ESOP debt.

+ References

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value of unearned shares for all classes of common stock and nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by an employee stock ownership plan (ESOP). Includes the sale of shares or the issuance treasury shares to an ESOP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6418591&loc=d3e17344-113926

+ Details

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Balance Type:	debit
Period Type:	instant

- Details

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- Details

Name:	us-gaap_PlanNameAxis=mfsf_EmployeeStockOwnershipPlanESOPPlanMember
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- Details

Name:	us-gaap_PlanNameAxis=mfsf_FourZeroOneKPlanMember
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- Details

Name:	us-gaap_PlanNameAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
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Employee Benefits (Narrative) (Details) (USD $)	12 Months Ended
Employee Benefits (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Number of unearned ESOP shares	0	0	31,785
Employee stock owner ship plan expense	$ 0	$ 474,000	$ 328,000
MutualFirst Financial, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee stock owner ship plan expense		474,000	329,000
Retirement Savings 401(k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer 401(k) matching contribution to employee, maximum percentage	5.00%
Defined contribution plan, contribution	739,000	552,000	537,000
Retirement Savings 401(k) Plan [Member] \| Up to 4% of participant contributions [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of participant contributions	100.00%
Percentage employer matching contribution	4.00%
Retirement Savings 401(k) Plan [Member] \| 5%-6% of participant contributions [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of participant contributions	50.00%
Retirement Savings 401(k) Plan [Member] \| 5%-6% of participant contributions [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage employer matching contribution	5.00%
Retirement Savings 401(k) Plan [Member] \| 5%-6% of participant contributions [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage employer matching contribution	6.00%
Supplemental Retirement Plan and Deferred Compensation Arrangements [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation arrangement with individual, compensation expense	730,000	748,000	675,000
ESOP [Member]
Defined Benefit Plan Disclosure [Line Items]
Unearned employee stock ownership plan (ESOP) shares, fair value			$ 363,000