| **Income Tax - Deferred Tax Assets and Liabilities (Details) (USD $)In Thousands, unless otherwise specified** | 12 Months Ended                                                                                    |
|----------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------|
||
| **Assets:**                                                                                                    |                                                                                               |   |
| Differences in Accounting for Loan Losses                                                                      | $ 26,665us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses       | $ 28,064us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses |
| Differences in Accounting for Loan Fees                                                                        | 747frme_DeferredTaxAssetsTaxDeferredExpenseLoanFees                                                | 736frme_DeferredTaxAssetsTaxDeferredExpenseLoanFees |
| Differences in Accounting for Loans and Securities                                                             | 9,910frme_DeferredTaxAssetLoanAndSecurities                                                        | 13,579frme_DeferredTaxAssetLoanAndSecurities |
| Deferred Compensation                                                                                          | 5,234us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther                       | 5,479us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther |
| Difference in Accounting for Pensions and Other Employee Benefits                                              | 1,084frme_DeferredTaxAssetTaxDeferredExpenseCompensationAndBenefitsPensionAndOtherEmployeeBenefits |    |
| Federal & State Income Tax Loss Carryforward and Credits                                                   | 23,977frme_DeferredTaxAssetsTaxDeferredExpenseFederalAndStateIncomeTaxLossCarryforwardAndCredits   | 24,981frme_DeferredTaxAssetsTaxDeferredExpenseFederalAndStateIncomeTaxLossCarryforwardAndCredits |
| Net Unrealized Loss on Securities Available for Sale                                                           |                                                                                          | 151us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross |
| Other                                                                                                          | 8,535us-gaap_DeferredTaxAssetsOther                                                                | 12,828us-gaap_DeferredTaxAssetsOther |
| Total Assets                                                                                                   | 76,152us-gaap_DeferredTaxAssetsGross                                                               | 85,818us-gaap_DeferredTaxAssetsGross |
| **Liabilities:**                                                                                               |                                                                                               |   |
| Differences in Depreciation Methods                                                                            | 8,220us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment                                       | 8,008us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
| Difference in Accounting for Pensions and Other Employee Benefits                                              |                                                                                          | 1,096frme_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsPensionAndOtherEmployeeBenefits |
| State Income Tax                                                                                               | 591frme_DeferredTaxLiabilitiesStateIncomeTax                                                       | 354frme_DeferredTaxLiabilitiesStateIncomeTax |
| Net Unrealized Gain on Securities Available for Sale                                                           | 7,591us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities                              |    |
| Gain on FDIC Modified Whole Bank Transaction                                                                   | 1,694frme_DeferredTaxLiabilitiesGainOnFdicModifiedWholeBankTransaction                             | 2,147frme_DeferredTaxLiabilitiesGainOnFdicModifiedWholeBankTransaction |
| Other                                                                                                          | 1,096us-gaap_DeferredTaxLiabilitiesOther                                                           | 1,257us-gaap_DeferredTaxLiabilitiesOther |
| Total Liabilities                                                                                              | 19,192us-gaap_DeferredIncomeTaxLiabilities                                                         | 12,862us-gaap_DeferredIncomeTaxLiabilities |
| Net Deferred Tax Asset Before Valuation Allowance                                                              | 56,960frme_NetDeferredTaxAssetsBeforeValuationAllowance                                            | 72,956frme_NetDeferredTaxAssetsBeforeValuationAllowance |
| **Valuation allowance:**                                                                                       |                                                                                               |   |
| Beginning Balance                                                                                              | (17,171)us-gaap_DeferredTaxAssetsValuationAllowance                                                | (13,859)us-gaap_DeferredTaxAssetsValuationAllowance |
| Decrease/(Increase) During the Year                                                                            | (397)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount                                      | (3,312)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
| Ending Balance                                                                                                 | (17,568)us-gaap_DeferredTaxAssetsValuationAllowance                                                | (17,171)us-gaap_DeferredTaxAssetsValuationAllowance |
| Net Deferred Tax Asset                                                                                         | $ 39,392us-gaap_DeferredTaxAssetsNet                                                               | $ 55,785us-gaap_DeferredTaxAssetsNet |

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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred tax liability attributable to taxable temporary differences.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other compensation and benefits not separately disclosed.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the provision for loan losses.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on available-for-sale securities.
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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.
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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on trading securities.
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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.
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