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Loans and Allowance - Summary of Troubled Debt Restructurings by Modification (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Financing Receivable, Modifications [Line Items]    
Modification $ 2,908frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod $ 149frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
Troubled Debt Restructurings, Term Modifications    
Financing Receivable, Modifications [Line Items]    
Modification 1,803frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsTermModificationsMember		   
Troubled Debt Restructurings Rate Modifications    
Financing Receivable, Modifications [Line Items]    
Modification 26frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsRateModificationsMember		 134frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsRateModificationsMember
Troubled Debt Restructurings, Combination    
Financing Receivable, Modifications [Line Items]    
Modification 1,079frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsRateAndTermModificationsMember		 15frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsRateAndTermModificationsMember
Commercial and industrial loans    
Financing Receivable, Modifications [Line Items]    
Modification 1,332frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= frme_CommercialAndIndustrialLoansMember		  
Commercial and industrial loans | Troubled Debt Restructurings, Term Modifications    
Financing Receivable, Modifications [Line Items]    
Modification 253frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= frme_CommercialAndIndustrialLoansMember
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsTermModificationsMember		  
Commercial and industrial loans | Troubled Debt Restructurings Rate Modifications    
Financing Receivable, Modifications [Line Items]    
Modification     
Commercial and industrial loans | Troubled Debt Restructurings, Combination    
Financing Receivable, Modifications [Line Items]    
Modification 1,079frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= frme_CommercialAndIndustrialLoansMember
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsRateAndTermModificationsMember		  
Real estate loans - Construction    
Financing Receivable, Modifications [Line Items]    
Modification 2frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		  
Real estate loans - Construction | Troubled Debt Restructurings, Term Modifications    
Financing Receivable, Modifications [Line Items]    
Modification 2frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsTermModificationsMember		  
Real estate loans - Commercial and farmland    
Financing Receivable, Modifications [Line Items]    
Modification 1,548frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= frme_CommercialAndFarmLandLoansMember		  
Real estate loans - Commercial and farmland | Troubled Debt Restructurings, Term Modifications    
Financing Receivable, Modifications [Line Items]    
Modification 1,548frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= frme_CommercialAndFarmLandLoansMember
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsTermModificationsMember		  
Real estate loans - Residential    
Financing Receivable, Modifications [Line Items]    
Modification 26frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember		 134frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
Real estate loans - Residential | Troubled Debt Restructurings, Term Modifications    
Financing Receivable, Modifications [Line Items]    
Modification      
Real estate loans - Residential | Troubled Debt Restructurings Rate Modifications    
Financing Receivable, Modifications [Line Items]    
Modification 26frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsRateModificationsMember		 134frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsRateModificationsMember
Real estate loans - Residential | Troubled Debt Restructurings, Combination    
Financing Receivable, Modifications [Line Items]    
Modification      
Individuals' loans for household and other personal expenditures    
Financing Receivable, Modifications [Line Items]    
Modification   15frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Individuals' loans for household and other personal expenditures | Troubled Debt Restructurings Rate Modifications    
Financing Receivable, Modifications [Line Items]    
Modification     
Individuals' loans for household and other personal expenditures | Troubled Debt Restructurings, Combination    
Financing Receivable, Modifications [Line Items]    
Modification   $ 15frme_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
/ frme_TroubledDebtRestructuringModficationByTypeAxis
= frme_TroubledDebtRestructuringsRateAndTermModificationsMember