| **Condensed Financial Information (parent company only) - Statement of Operations (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended                                                                                                            | 12 Months Ended                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------|
||
| **Income**                                                                                                                                    |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   |   |   |   |
| Other income                                                                                                                                  |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | $ 5,705us-gaap_NoninterestIncomeOtherOperatingIncome | $ 4,197us-gaap_NoninterestIncomeOtherOperatingIncome | $ 1,808us-gaap_NoninterestIncomeOtherOperatingIncome |
| **Expenses**                                                                                                                                  |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   |   |   |   |
| Interest expense                                                                                                                              | 5,893us-gaap_InterestExpense                                                                                              | 5,424us-gaap_InterestExpense                                                                                              | 5,408us-gaap_InterestExpense | 5,117us-gaap_InterestExpense | 4,572us-gaap_InterestExpense | 3,714us-gaap_InterestExpense | 4,003us-gaap_InterestExpense | 4,280us-gaap_InterestExpense | 21,842us-gaap_InterestExpense | 16,569us-gaap_InterestExpense | 23,613us-gaap_InterestExpense |
| Salaries and employee benefits                                                                                                                |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 96,499us-gaap_LaborAndRelatedExpense | 85,413us-gaap_LaborAndRelatedExpense | 79,398us-gaap_LaborAndRelatedExpense |
| Other expenses                                                                                                                                |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 14,239us-gaap_OtherNoninterestExpense | 11,142us-gaap_OtherNoninterestExpense | 11,505us-gaap_OtherNoninterestExpense |
| INCOME BEFORE INCOME TAX                                                                                                                      | 20,777us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 21,984us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 20,802us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 17,989us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 14,634us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,070us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 14,970us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 16,533us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 81,552us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 59,207us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 60,989us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
| Income tax benefit                                                                                                                            | (5,517)us-gaap_IncomeTaxExpenseBenefit                                                                                    | (5,862)us-gaap_IncomeTaxExpenseBenefit                                                                                    | (5,642)us-gaap_IncomeTaxExpenseBenefit | (4,369)us-gaap_IncomeTaxExpenseBenefit | (3,187)us-gaap_IncomeTaxExpenseBenefit | (2,667)us-gaap_IncomeTaxExpenseBenefit | (4,155)us-gaap_IncomeTaxExpenseBenefit | (4,668)us-gaap_IncomeTaxExpenseBenefit | (21,390)us-gaap_IncomeTaxExpenseBenefit | (14,677)us-gaap_IncomeTaxExpenseBenefit | (15,867)us-gaap_IncomeTaxExpenseBenefit |
| Preferred stock dividends                                                                                                                     |                                                                                                                 |                                                                                                                 |    |    | (241)us-gaap_PreferredStockDividendsAndOtherAdjustments | (430)us-gaap_PreferredStockDividendsAndOtherAdjustments | (852)us-gaap_PreferredStockDividendsAndOtherAdjustments | (857)us-gaap_PreferredStockDividendsAndOtherAdjustments |    | (2,380)us-gaap_PreferredStockDividendsAndOtherAdjustments | (4,539)us-gaap_PreferredStockDividendsAndOtherAdjustments |
| Net income available to common stockholders                                                                                                   | 15,260us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic                                                             | 16,122us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic                                                             | 15,160us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 13,620us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 11,206us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 9,973us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 9,963us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 11,008us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 60,162us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 42,150us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 40,583us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
| Net income                                                                                                                                    | 15,260us-gaap_NetIncomeLoss                                                                                               | 16,122us-gaap_NetIncomeLoss                                                                                               | 15,160us-gaap_NetIncomeLoss | 13,620us-gaap_NetIncomeLoss | 11,447us-gaap_NetIncomeLoss | 10,403us-gaap_NetIncomeLoss | 10,815us-gaap_NetIncomeLoss | 11,865us-gaap_NetIncomeLoss | 60,162us-gaap_NetIncomeLoss | 44,530us-gaap_NetIncomeLoss | 45,122us-gaap_NetIncomeLoss |
| Other comprehensive income (loss)                                                                                                             |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 4,780us-gaap_OtherComprehensiveIncomeLossNetOfTax | (911)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (1,897)us-gaap_OtherComprehensiveIncomeLossNetOfTax |
| Comprehensive income                                                                                                                          |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 64,942us-gaap_ComprehensiveIncomeNetOfTax | 43,619us-gaap_ComprehensiveIncomeNetOfTax | 43,225us-gaap_ComprehensiveIncomeNetOfTax |
| Parent                                                                                                                                        |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   |   |   |   |
| **Income**                                                                                                                                    |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   |   |   |   |
| Dividends from subsidiaries                                                                                                                   |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 53,231frme_DividendIncomeFromSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 63,732frme_DividendIncomeFromSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 30,096frme_DividendIncomeFromSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Other income                                                                                                                                  |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 538us-gaap_NoninterestIncomeOtherOperatingIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 45us-gaap_NoninterestIncomeOtherOperatingIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 85us-gaap_NoninterestIncomeOtherOperatingIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Total income                                                                                                                                  |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 53,769frme_InterestAndDividendIncomeOperatingAndNoninterestIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 63,777frme_InterestAndDividendIncomeOperatingAndNoninterestIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 30,181frme_InterestAndDividendIncomeOperatingAndNoninterestIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| **Expenses**                                                                                                                                  |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   |   |   |   |
| Interest expense                                                                                                                              |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 6,616us-gaap_InterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 3,531us-gaap_InterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 4,655us-gaap_InterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Salaries and employee benefits                                                                                                                |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 3,128us-gaap_LaborAndRelatedExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 3,284us-gaap_LaborAndRelatedExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 3,194us-gaap_LaborAndRelatedExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Net occupancy and equipment expenses                                                                                                          |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 442frme_OccupancyAndEquipmentExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 258frme_OccupancyAndEquipmentExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 312frme_OccupancyAndEquipmentExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Telephone expenses                                                                                                                            |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 27us-gaap_Communication/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 42us-gaap_Communication/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 30us-gaap_Communication/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Postage and courier expenses                                                                                                                  |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   |    |    | 1us-gaap_PostageExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Other expenses                                                                                                                                |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 1,972us-gaap_OtherNoninterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 2,617us-gaap_OtherNoninterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 1,502us-gaap_OtherNoninterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Total expenses                                                                                                                                |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 12,185frme_InterestAndNoninterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 9,732frme_InterestAndNoninterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 9,694frme_InterestAndNoninterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| INCOME BEFORE INCOME TAX                                                                                                                      |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 41,584us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 54,045us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 20,487us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Income tax benefit                                                                                                                            |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 3,999us-gaap_IncomeTaxExpenseBenefit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 3,153us-gaap_IncomeTaxExpenseBenefit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 3,316us-gaap_IncomeTaxExpenseBenefit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Income before equity in undistributed income of subsidiaries                                                                                  |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 45,583frme_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestmentsIncomeTaxesExtraordinaryItemsNoncontrollingInterestAfterTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 57,198frme_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestmentsIncomeTaxesExtraordinaryItemsNoncontrollingInterestAfterTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 23,803frme_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestmentsIncomeTaxesExtraordinaryItemsNoncontrollingInterestAfterTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Equity in undistributed (distributions in excess of) income of subsidiaries                                                                   |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 14,579frme_IncomeLossFromSubsidiariesNetOfDividendsAndTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (12,668)frme_IncomeLossFromSubsidiariesNetOfDividendsAndTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 21,319frme_IncomeLossFromSubsidiariesNetOfDividendsAndTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Net income                                                                                                                                    |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 60,162us-gaap_IncomeLossAttributableToParent/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 44,530us-gaap_IncomeLossAttributableToParent/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 45,122us-gaap_IncomeLossAttributableToParent/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Preferred stock dividends                                                                                                                     |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   |    | (2,380)us-gaap_PreferredStockDividendsAndOtherAdjustments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (4,539)us-gaap_PreferredStockDividendsAndOtherAdjustments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Net income available to common stockholders                                                                                                   |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 60,162us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 42,150us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 40,583us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Net income                                                                                                                                    |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 60,162us-gaap_NetIncomeLoss/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 44,530us-gaap_NetIncomeLoss/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 45,122us-gaap_NetIncomeLoss/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Other comprehensive income (loss)                                                                                                             |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | 4,780us-gaap_OtherComprehensiveIncomeLossNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (911)us-gaap_OtherComprehensiveIncomeLossNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (1,897)us-gaap_OtherComprehensiveIncomeLossNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Comprehensive income                                                                                                                          |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   | $ 64,942us-gaap_ComprehensiveIncomeNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | $ 43,619us-gaap_ComprehensiveIncomeNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | $ 43,225us-gaap_ComprehensiveIncomeNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |

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| - Definition
Income (Loss) From Continuing Operations Before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest, After tax
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(Income) Loss From Subsidiaries, Net of Dividends and Tax
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| - Definition
Interest And Dividend Income, Operating and Noninterest Income
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Interest And Noninterest Expense
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Occupancy and Equipment Expense
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| - Definition
The amount of expense incurred in the period for communication, which is the exchange of information by several methods.
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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
The portion of profit or loss for the period which is attributable to the parent.
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| - Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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| - Definition
The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).
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Represents other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy.
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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Other noninterest expenses that are not separately presented in any other noninterest expense category.
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Amount of expense associated with postage.
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The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders.
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