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Regulatory Capital (Actual Capital Amounts and Ratios) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
MutualFirst Consolidated [Member]    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Leverage Capital Level, Actual Capital Levels Amount $ 120,568,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [1] $ 109,771,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [2]
Total Risk-Based Capital Level, Actual Capital Levels Amount 132,847,000mfsf_TotalRiskBasedCapital
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3] 121,891,000mfsf_TotalRiskBasedCapital
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3]
Tier 1 Risk-Based Capital Level, Actual Capital Levels Amount 120,568,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [4] 109,771,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [5]
Leverage Capital Level, Actual Capital Levels Ratio 8.50%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [1] 7.90%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [2]
Total Risk-Based Capital Level, Actual Capital Levels Ratio 13.50%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3] 12.60%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3]
Tier 1 Risk-Based Capital Level, Actual Capital Levels Ratio 12.30%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [4] 11.30%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [5]
Leverage Capital Level, Minimum Regulatory Capital Ratios Amount 56,687,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [1] 55,652,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [2]
Total Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount 78,537,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3] 77,507,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3]
Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount 39,269,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [4] 38,754,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [5]
Leverage Capital Level, Minimum Regulatory Capital Ratios 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [1] 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [2]
Total Risk-Based Capital Level, Minimum Regulatory Capital Ratios 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3] 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3]
Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [4] 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [5]
Total Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Amount 98,171,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3] 96,884,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3]
Tier 1 Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Amount 58,903,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [4] 58,131,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [5]
Total Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3] 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [3]
Tier 1 Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [4] 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 [5]
Average Total Regulatory Capital Assets 1,400,000,000mfsf_AverageTotalRegulatoryCapitalAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 1,400,000,000mfsf_AverageTotalRegulatoryCapitalAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember
Risk-Weighted Regulatory Capital Assets 981,700,000us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember		 968,800,000us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_CompanyMember
MutualBank [Member]    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Leverage Capital Level, Actual Capital Levels Amount 124,083,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= mfsf_BankMember		 [1] 115,174,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= mfsf_BankMember		 [2]
Total Risk-Based Capital Level, Actual Capital Levels Amount 136,362,000mfsf_TotalRiskBasedCapital
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3] 127,294,000mfsf_TotalRiskBasedCapital
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3]
Tier 1 Risk-Based Capital Level, Actual Capital Levels Amount 124,083,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= mfsf_BankMember		 [4] 115,174,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= mfsf_BankMember		 [5]
Leverage Capital Level, Actual Capital Levels Ratio 8.80%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [1] 8.30%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [2]
Total Risk-Based Capital Level, Actual Capital Levels Ratio 13.90%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3] 13.20%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3]
Tier 1 Risk-Based Capital Level, Actual Capital Levels Ratio 12.60%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [4] 11.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [5]
Leverage Capital Level, Minimum Regulatory Capital Ratios Amount 56,610,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_BankMember		 [1] 55,621,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_BankMember		 [2]
Total Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount 78,515,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3] 77,466,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3]
Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount 39,257,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_BankMember		 [4] 38,733,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= mfsf_BankMember		 [5]
Leverage Capital Level, Minimum Regulatory Capital Ratios 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [1] 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [2]
Total Risk-Based Capital Level, Minimum Regulatory Capital Ratios 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3] 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3]
Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [4] 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [5]
Leverage Capital Level, Minimum Required To be Considered Well-Capitalized Amount 70,763,000us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_BankMember		 [1] 69,526,000us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_BankMember		 [2]
Total Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Amount 98,143,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3] 96,832,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3]
Tier 1 Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Amount 58,886,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_BankMember		 [4] 58,099,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= mfsf_BankMember		 [5]
Leverage Capital Level, Minimum Required To be Considered Well-Capitalized Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [1] 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [2]
Total Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3] 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [3]
Tier 1 Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [4] 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 [5]
Average Total Regulatory Capital Assets 1,400,000,000mfsf_AverageTotalRegulatoryCapitalAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 1,400,000,000mfsf_AverageTotalRegulatoryCapitalAssets
/ dei_LegalEntityAxis
= mfsf_BankMember
Risk-Weighted Regulatory Capital Assets $ 981,400,000us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember		 $ 968,300,000us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= mfsf_BankMember
[1] (1) Tier 1 Capital to Average Total Assets of $1.4 billion for the Bank and $1.4 billion for the Company at December 31, 2014.
[2] (1) Tier 1 Capital to Average Total Assets of $1.4 billion for the Bank and $1.4 billion for the Company at December 31, 2013.
[3] (3) Total Capital to Risk-Weighted Assets.
[4] (2) Tier 1 Capital to Risk-Weighted Assets of $981.4 million for the Bank and $981.7 million for the Company at December 31, 2014.
[5] (2) Tier 1 Capital to Risk-Weighted Assets of $968.3 million for the Bank and $968.8 million for the Company at December 31, 2013.