| **Loans and Allowance - Credit Quality of Loan Portfolio by Loan Class (Details) (USD $)In Thousands, unless otherwise specified** | Mar. 31, 2015                                                                                                                                                                                                                                                      | Dec. 31, 2014                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | $ 3,965,532us-gaap_LoansAndLeasesReceivableGrossCarryingAmount                                                                                                                                                                                                     | $ 3,924,865us-gaap_LoansAndLeasesReceivableGrossCarryingAmount                                                                                                                                                                                                     |
| Commercial and industrial loans                                                                                                    |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 938,937us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember                                                                                 | 896,688us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember                                                                                 |
| Agricultural production financing and other loans to farmers                                                                       |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 95,652us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_FarmingAndAgricultureMember                                                                                         | 104,927us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_FarmingAndAgricultureMember                                                                                        |
| Real estate loans - Construction                                                                                                   |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 237,036us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                                                                                         | 207,221us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember                                                                                         |
| Real estate loans - Commercial and farmland                                                                                        |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 1,646,418us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember                                                                                 | 1,672,661us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember                                                                                 |
| Real estate loans - Residential                                                                                                    |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 640,451us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember                                                                                     | 647,315us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember                                                                                     |
| Real estate loans - Home equity                                                                                                    |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 286,914us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember                                                                                                | 286,529us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember                                                                                                |
| Individuals' loans for household and other personal expenditures                                                                   |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 70,223us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                                                                                               | 73,400us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember                                                                                               |
| Lease financing receivables, net of unearned income                                                                                |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 853us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_FinanceLeasesFinancingReceivableMember                                                                              | 1,106us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_FinanceLeasesFinancingReceivableMember                                                                            |
| Other loans                                                                                                                        |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 49,048us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_OtherLoansMember                                                                                                    | 35,018us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_OtherLoansMember                                                                                                    |
| Commercial Pass                                                                                                                    |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 2,901,056us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                                                                                                                                             | 2,849,876us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                                                                                                                                             |
| Commercial Pass | Commercial and industrial loans                                                                                  |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 867,157us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                       | 823,732us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                       |
| Commercial Pass | Agricultural production financing and other loans to farmers                                                     |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 89,454us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_FarmingAndAgricultureMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                               | 96,155us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_FarmingAndAgricultureMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                               |
| Commercial Pass | Real estate loans - Construction                                                                                 |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 217,161us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                               | 185,394us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                               |
| Commercial Pass | Real estate loans - Commercial and farmland                                                                      |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 1,521,989us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                       | 1,552,781us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                       |
| Commercial Pass | Real estate loans - Residential                                                                                  |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 149,021us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                           | 149,430us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                           |
| Commercial Pass | Real estate loans - Home equity                                                                                  |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 6,478us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                                        | 6,368us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                                        |
| Commercial Pass | Lease financing receivables, net of unearned income                                                              |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 748us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_FinanceLeasesFinancingReceivableMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                    | 998us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_FinanceLeasesFinancingReceivableMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                    |
| Commercial Pass | Other loans                                                                                                      |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 49,048us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_OtherLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                                          | 35,018us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_OtherLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PassMember                                          |
| Commercial Special Mention                                                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 86,185us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                                                                                                                                      | 64,631us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                                                                                                                                      |
| Commercial Special Mention | Commercial and industrial loans                                                                       |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 28,888us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember              | 24,455us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember              |
| Commercial Special Mention | Agricultural production financing and other loans to farmers                                          |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 2,469us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_FarmingAndAgricultureMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                      | 1,195us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_FarmingAndAgricultureMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                      |
| Commercial Special Mention | Real estate loans - Construction                                                                      |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 2,359us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                       | 3,164us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                       |
| Commercial Special Mention | Real estate loans - Commercial and farmland                                                           |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 48,219us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                | 29,484us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                |
| Commercial Special Mention | Real estate loans - Residential                                                                       |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 4,232us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                   | 6,321us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                   |
| Commercial Special Mention | Real estate loans - Home equity                                                                       |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 18us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                                 | 12us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SpecialMentionMember                                 |
| Commercial Special Mention | Other loans                                                                                           |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                               |
| Commercial Substandard                                                                                                             |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 134,988us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                                                                                                                                        | 160,608us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                                                                                                                                        |
| Commercial Substandard | Commercial and industrial loans                                                                           |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 41,023us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                 | 48,226us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                 |
| Commercial Substandard | Agricultural production financing and other loans to farmers                                              |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 3,729us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_FarmingAndAgricultureMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                         | 7,577us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_FarmingAndAgricultureMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                         |
| Commercial Substandard | Real estate loans - Construction                                                                          |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 2,493us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                          | 2,928us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                          |
| Commercial Substandard | Real estate loans - Commercial and farmland                                                               |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 76,208us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                   | 90,161us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                   |
| Commercial Substandard | Real estate loans - Residential                                                                           |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 10,845us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                     | 10,918us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                     |
| Commercial Substandard | Real estate loans - Home equity                                                                           |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 585us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                                   | 690us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember                                   |
| Commercial Substandard | Lease financing receivables, net of unearned income                                                       |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 105us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_FinanceLeasesFinancingReceivableMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember             | 108us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_FinanceLeasesFinancingReceivableMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_SubstandardMember             |
| Commercial Substandard | Other loans                                                                                               |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |
| Commercial Doubtful                                                                                                                |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 1,869us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_DoubtfulMember                                                                                                                                             | 275us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_DoubtfulMember                                                                                                                                               |
| Commercial Doubtful | Commercial and industrial loans                                                                              |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 1,869us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_DoubtfulMember                     | 275us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndIndustrialLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_DoubtfulMember                       |
| Commercial Doubtful | Real estate loans - Residential                                                                              |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |
| Consumer Performing                                                                                                                |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 829,048us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember                                                                                                                      | 837,296us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember                                                                                                                      |
| Consumer Performing | Real estate loans - Construction                                                                             |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 14,582us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember       | 15,588us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember       |
| Consumer Performing | Real estate loans - Residential                                                                              |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 466,806us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember  | 470,972us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember  |
| Consumer Performing | Real estate loans - Home equity                                                                              |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 277,578us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember             | 277,571us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember             |
| Consumer Performing | Individuals' loans for household and other personal expenditures                                             |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 70,082us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember            | 73,165us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_PerformingFinancingReceivableMember            |
| Consumer Non-Performing                                                                                                            |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 12,386us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember                                                                                                                    | 12,179us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember                                                                                                                    |
| Consumer Non-Performing | Real estate loans - Construction                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 441us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember       | 147us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConstructionLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember       |
| Consumer Non-Performing | Real estate loans - Commercial and farmland                                                              |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 2us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember   | 235us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= frme_CommercialAndFarmLandLoansMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember |
| Consumer Non-Performing | Real estate loans - Residential                                                                          |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 9,547us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember | 9,674us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ResidentialRealEstateMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember |
| Consumer Non-Performing | Real estate loans - Home equity                                                                          |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | 2,255us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember            | 1,888us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_HomeEquityMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember            |
| Consumer Non-Performing | Individuals' loans for household and other personal expenditures                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| **Financing Receivable, Recorded Investment [Line Items]**                                                                         |                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |
| Loans                                                                                                                              | $ 141us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember          | $ 235us-gaap_LoansAndLeasesReceivableGrossCarryingAmount/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= us-gaap_ConsumerLoanMember/ us-gaap_InternalCreditAssessmentAxis= us-gaap_NonperformingFinancingReceivableMember          |

| X                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522
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| X                                                                                                                                                                                                             |
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| X                                                                                                                                                                                                      |
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| X                                                                                                                                                                                                     |
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| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                                    |
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| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialRealEstateMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                   |
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