| **Disclosures About Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Details) (USD $)In Thousands, unless otherwise specified** | Mar. 31, 2015                                                                                                                                                                         | Dec. 31, 2014                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Assets:**                                                                                                                                                           |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Investment securities available for sale                                                                                                                              | $ 538,055us-gaap_AvailableForSaleSecurities                                                                                                                                           | $ 549,543us-gaap_AvailableForSaleSecurities                                                                                                                                           |
| Investment securities held to maturity                                                                                                                                | 670,611us-gaap_HeldToMaturitySecuritiesFairValue                                                                                                                                      | 647,723us-gaap_HeldToMaturitySecuritiesFairValue                                                                                                                                      |
| Loans held for sale                                                                                                                                                   | 6,392us-gaap_LoansReceivableHeldForSaleNet                                                                                                                                            | 7,235us-gaap_LoansReceivableHeldForSaleNet                                                                                                                                            |
| Quoted Prices in Active Markets for Identical Assets (Level 1)                                                                                                        |                                                                                                                                                                                  |                                                                                                                                                                                  |
| **Assets:**                                                                                                                                                           |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Cash and cash equivalents                                                                                                                                             | 89,243us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                          | 118,616us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                         |
| Interest-bearing time deposits                                                                                                                                        | 83,228frme_InterestBearingDepositsWithBanksFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                   | 47,520frme_InterestBearingDepositsWithBanksFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                   |
| **Liabilities:**                                                                                                                                                      |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Deposits                                                                                                                                                              | 3,518,556us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                     | 3,523,199us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                     |
| Significant Other Observable Inputs (Level 2)                                                                                                                         |                                                                                                                                                                                  |                                                                                                                                                                                  |
| **Assets:**                                                                                                                                                           |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Investment securities available for sale                                                                                                                              | 531,857us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                        | 542,897us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                        |
| Investment securities held to maturity                                                                                                                                | 638,360us-gaap_HeldToMaturitySecuritiesFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                 | 614,457us-gaap_HeldToMaturitySecuritiesFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                 |
| Loans held for sale                                                                                                                                                   | 6,392us-gaap_LoansReceivableHeldForSaleNet/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                       | 7,235us-gaap_LoansReceivableHeldForSaleNet/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                       |
| Federal Reserve Bank and Federal Home Loan Bank stock                                                                                                                 | 41,273us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                            | 41,353us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                            |
| Interest rate swap and cap asset                                                                                                                                      | 4,851frme_InterestRateSwapsAssetsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                             | 3,867frme_InterestRateSwapsAssetsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                             |
| Interest receivable                                                                                                                                                   | 19,557frme_InterestReceivableFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                 | 19,984frme_InterestReceivableFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                 |
| **Liabilities:**                                                                                                                                                      |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Deposits                                                                                                                                                              | 1,116,309us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                     | 1,099,610us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                     |
| **Borrowings:**                                                                                                                                                       |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Federal funds purchased                                                                                                                                               |                                                                                                                                                                                  | 15,381us-gaap_FederalFundsPurchasedFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                           |
| Securities sold under repurchase agreements                                                                                                                           | 134,035us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member              | 124,539us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member              |
| Federal Home Loan Bank advances                                                                                                                                       | 167,903frme_FederalHomeLoanBankAdvancesFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                 | 146,669frme_FederalHomeLoanBankAdvancesFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                 |
| Subordinated debentures and term loans                                                                                                                                | 85,413us-gaap_OtherLiabilitiesFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                | 92,802us-gaap_OtherLiabilitiesFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                |
| Interest rate swap liability                                                                                                                                          | 8,569frme_InterestRateSwapLiabilitiesFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                         | 6,537frme_InterestRateSwapLiabilitiesFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                         |
| Interest payable                                                                                                                                                      | 3,685frme_InterestPayableFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                     | 3,201frme_InterestPayableFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                     |
| Significant Unobservable Inputs (Level 3)                                                                                                                             |                                                                                                                                                                                  |                                                                                                                                                                                  |
| **Assets:**                                                                                                                                                           |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Investment securities available for sale                                                                                                                              | 6,198us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                          | 6,646us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                          |
| Investment securities held to maturity                                                                                                                                | 32,251us-gaap_HeldToMaturitySecuritiesFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                  | 33,266us-gaap_HeldToMaturitySecuritiesFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                  |
| Loans                                                                                                                                                                 | 3,867,719us-gaap_LoansReceivableFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                              | 3,810,912us-gaap_LoansReceivableFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                              |
| Carrying Amount                                                                                                                                                       |                                                                                                                                                                                  |                                                                                                                                                                                  |
| **Assets:**                                                                                                                                                           |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Cash and cash equivalents                                                                                                                                             | 89,243us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                             | 118,616us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                            |
| Interest-bearing time deposits                                                                                                                                        | 83,228frme_InterestBearingDepositsWithBanksFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                      | 47,520frme_InterestBearingDepositsWithBanksFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                      |
| Investment securities available for sale                                                                                                                              | 538,055us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                           | 549,543us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                           |
| Investment securities held to maturity                                                                                                                                | 651,418us-gaap_HeldToMaturitySecuritiesFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                    | 631,088us-gaap_HeldToMaturitySecuritiesFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                    |
| Loans held for sale                                                                                                                                                   | 6,392us-gaap_LoansReceivableHeldForSaleNet/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                          | 7,235us-gaap_LoansReceivableHeldForSaleNet/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                          |
| Loans                                                                                                                                                                 | 3,902,731us-gaap_LoansReceivableFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                 | 3,860,901us-gaap_LoansReceivableFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                 |
| Federal Reserve Bank and Federal Home Loan Bank stock                                                                                                                 | 41,273us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember               | 41,353us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember               |
| Interest rate swap and cap asset                                                                                                                                      | 4,851frme_InterestRateSwapsAssetsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                | 3,867frme_InterestRateSwapsAssetsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                |
| Interest receivable                                                                                                                                                   | 19,557frme_InterestReceivableFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                    | 19,984frme_InterestReceivableFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                    |
| **Liabilities:**                                                                                                                                                      |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Deposits                                                                                                                                                              | 4,648,075us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                        | 4,640,694us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                        |
| **Borrowings:**                                                                                                                                                       |                                                                                                                                                                                  |                                                                                                                                                                                  |
| Federal funds purchased                                                                                                                                               |                                                                                                                                                                                  | 15,381us-gaap_FederalFundsPurchasedFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                              |
| Securities sold under repurchase agreements                                                                                                                           | 134,023us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember | 124,539us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |
| Federal Home Loan Bank advances                                                                                                                                       | 166,326frme_FederalHomeLoanBankAdvancesFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                    | 145,264frme_FederalHomeLoanBankAdvancesFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                    |
| Subordinated debentures and term loans                                                                                                                                | 126,875us-gaap_OtherLiabilitiesFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                  | 126,810us-gaap_OtherLiabilitiesFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                  |
| Interest rate swap liability                                                                                                                                          | 8,569frme_InterestRateSwapLiabilitiesFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                            | 6,537frme_InterestRateSwapLiabilitiesFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                            |
| Interest payable                                                                                                                                                      | $ 3,685frme_InterestPayableFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                      | $ 3,201frme_InterestPayableFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                      |

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| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
+ References
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| - Definition
Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.
+ References
No definition available.
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| - Definition
Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank.
+ References
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| - Definition
Fair value of investments in debt securities classified as held-to-maturity.
+ References
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| - Definition
Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.
+ References
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| - Definition
Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.
+ References
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| - Definition
Fair value portion of other liabilities.
+ References
No definition available.
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| - Definition
Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611
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