| **Pension and Other Post Retirement Benefit Plans**   | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| **Compensation and Retirement Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| Pension and Other Post Retirement Benefit Plans       | PENSION AND OTHER POST RETIREMENT BENEFIT PLANSThe Corporation’s defined-benefit pension plans cover approximately 29 percent of the Corporation’s employees. In 2005, the Board of Directors of the Corporation approved the curtailment of the accumulation of defined benefits for future services provided by certain participants in the First Merchants Corporation Retirement Plan.  No additional pension benefits have been earned by any employees who had not attained both the age of 55 and accrued at least 10 years of vesting service as of March 1, 2005.  The benefits are based primarily on years of service and employees’ pay near retirement. Contributions are intended to provide not only for benefits attributed to service-to-date, but also for those expected to be earned in the future. The Corporation also maintains post retirement benefit plans that provide health insurance benefits to retirees. The plans allow retirees to be carried under the Corporation’s health insurance plan, generally from ages 55 to 65. The retirees pay 100 percent of the premiums due for their coverage.The table below sets forth the plans’ funded status and amounts recognized in the consolidated balance sheet at December 31, using measurement dates of December 31, 2012 and December 31, 2011. 2012 2011Change in benefit obligation   Benefit obligation at beginning of year$68,769 $61,422Service Cost161 252Interest Cost2,990 3,208Actuarial Loss (Gain)3,168 7,346Benefits paid(5,922) (3,459)Benefit obligation at end of year69,166 68,769Change in plan assets   Fair value of plan assets at beginning of year62,078 63,275Actual return on plan assets6,141 1,726Employer contributions568 536Benefits Paid(5,922) (3,459)End of Year62,865 62,078Funded Status at End of Year$(6,301) $(6,691)Assets and Liabilities Recognized in the Balance Sheets:   Deferred Tax Asset$9,200 $10,928Liabilities$6,301 $6,691Amounts Recognized in Accumulated Other Comprehensive Income Not Yet Recognized as Components of Net Periodic Benefit Cost Consist of:   Accumulated Loss$(17,085) $(16,310)Prior Service Credit(41) (56) $(17,126) $(16,366) The accumulated benefit obligation for all defined benefit plans was $69,139,000 and $68,729,000 at December 31, 2012 and 2011, respectively.Information for for pension plans with an accumulated benefit obligation in excess of plan assets is included in the table below.  December 31, 2012 December 31, 2011Projected Benefit Obligation$69,166 $68,769Accumulated Benefit Obligation$69,139 $68,729Fair Value of Plan Assets$62,865 $62,078The following table shows the components of net periodic pension costs: December 31, 2012 December 31, 2011Service Cost$161 $252Interest Cost2,990 3,208Expected Return on Plan Assets(4,216) (4,313)Amortization of Prior Service Costs25 25Amortization of Net Loss2,207 1,129Net Periodic Pension Cost$1,167 $301 Other changes in plan assets and benefit obligations recognized in other comprehensive income: December 31, 2012 December 31, 2011Net Periodic Pension Cost$1,167 $301Net gain (loss)1,242 9,933Actuarial gain (loss)(2,207) (1,129)Amortization of prior service (cost) credit(25) (25)Total Recognized in Other Comprehensive Income(990) 8,779Total Recognized in NPPC and OCI$177 $9,080The estimated net loss and transition obligation for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into net periodic pension cost over the next fiscal year are:December 31, 2012December 31, 2011Amortization of Net Loss$(2,158)$(2,319)Amortization of Prior Service Cost(25)(25)Total$(2,183)$(2,344)Significant assumptions include: December 31, 2012 December 31, 2011Weighted-average Assumptions Used to Determine Benefit Obligation:   Discount Rate4.00% 4.50%Rate of Compensation Increase for accruing active participants3.00% 4.00%Weighted-average Assumptions Used to Determine Benefit Cost:   Discount Rate4.50% 5.40%Expected Return on Plan Assets7.00% 7.00%Rate of Compensation Increase for accruing active participants4.00% 4.00% At December 31, 2012 and December 31, 2011, the Corporation based its estimate of the expected long-term rate of return on analysis of the historical returns of the plans and current market information available. The plans’ investment strategies are to provide for preservation of capital with an emphasis on long-term growth without undue exposure to risk. The assets of the plans’ are invested in accordance with the plans’ Investment Policy Statement, subject to strict compliance with ERISA and any other applicable statutes.The plans’ risk management practices include quarterly evaluations of investment managers, including reviews of compliance with investment manager guidelines and restrictions; ability to exceed performance objectives; adherence to the investment philosophy and style; and ability to exceed the performance of other investment managers. The evaluations are reviewed by management with appropriate follow-up and actions taken, as deemed necessary. The Investment Policy Statement generally allows investments in cash and cash equivalents, real estate, fixed income debt securities and equity securities, and specifically prohibits investments in derivatives, options, futures, private placements, short selling, non-marketable securities and purchases of non-investment grade bonds.At December 31, 2012, the maturities of the plans’ debt securities ranged from 31 days to 9.08 years, with a weighted average maturity of 4.97 years. At December 31, 2011, the maturities of the plans’ debt securities ranged from 45 days to 10.83 years, with a weighted average maturity of 5.38 years.The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid as of December 31, 2012. The minimum contribution required in 2013 will likely be zero but the Corporation may decide to make a discretionary contribution during the year.2013$3,98420144,11020154,23620164,21920174,201After 201721,414 $42,164 Plan assets are re-balanced quarterly. At December 31, 2012 and 2011, plan assets by category are as follows: December 31, 2012December 31, 2011 ActualTargetActualTargetCash and cash equivalents1.3%3.0%3.2%3.0%Equity securities53.751.049.751.0Debt securities43.044.045.544.0Alternative investments2.02.01.62.0 100.0%100.0%100.0%100.0% The First Merchants Corporation Retirement and Income Savings Plan (the “Savings Plan”), a Section 401(k) qualified defined contribution plan, was amended on March 1, 2005 to provide enhanced retirement benefits, including employer and matching contributions, for eligible employees of the Corporation and its subsidiaries. The Corporation matches employees’ contributions primarily at the rate of 50 percent for the first 6 percent of base salary contributed by participants.Beginning in 2005, employees who have completed 1000 hours of service and are an active employee on the last day of the year receive an additional retirement contribution after year-end. The amount of a participant’s retirement contribution varies from 2 to 7 percent of salary based upon years of service. Employees hired after January 1, 2010 do not participate in the additional retirement contribution. Full vesting occurs after five years of service. The Corporation’s expense for the Savings Plan, including the additional retirement contribution, was $2,914,000 for 2012, $2,824,000 for 2011 and $2,728,000 for 2010.The Corporation maintains post retirement benefit plans that provide health insurance benefits to retirees. The plans allow retirees to be carried under the Corporation’s health insurance plan, generally from ages 55 to 65. The retirees pay 100 percent of the premiums due for their coverage. The accrued benefits payable under the plans totaled $4,035,000 and $4,116,000 at December 31, 2012 and 2011, respectively. Post retirement plan expense totaled $477,000, $528,000 and $574,000 for the years ending December 31, 2012, 2011 and 2010, respectively.Pension Plan AssetsFollowing is a description of the valuation methodologies used for pension plan assets measured at fair value on a recurring basis, as well as the general classification of pension plan assets pursuant to the valuation hierarchy.Where quoted market prices are available in an active market, plan assets are classified within Level 1 of the valuation hierarchy.  Level 1 plan assets total $45,296,000 and include cash and cash equivalents, common and preferred stocks, mutual funds and corporate bonds and notes.  If quoted market prices are not available, then fair values are estimated by using pricing models, quoted prices of plan assets with similar characteristics or discounted cash flows.  Level 2 plan assets total $17,569,000 and include governmental agencies, taxable municipals, common collective trust investments (which are classified below as Party-in-Interest investments -- common bond fund and common equity fund) and certificates of deposit.  In certain cases where Level 1 or Level 2 inputs are not available, plan assets are classified within Level 3 of the hierarchy.  There are no assets classified within Level 3 of the hierarchy at December 31, 2012.  Fair Value Measurements Using   Quoted Prices inActive Markets forIdentical Assets Significant Other Observable Inputs SignificantUnobservableInputsDecember 31, 2012Fair Value(Level 1)(Level 2)(Level 3)Cash & Cash Equivalents$795$795Corporate Bonds and Notes6,1576,157Government Agency and Municipal Bonds and Notes8,642$8,642Certificates of Deposit357357Preferred Stock5252Party-in-Interest Investments   Common Stock898898Common Bond Fund4,0754,075Common Equity Fund4,4954,495Mutual FundsTaxable Bond7,4097,409Large Cap Equity16,16616,166Mid Cap Equity6,7726,772Small Cap Equity2,6402,640International Equity3,1783,178Specialty Alternative Equity1,2291,229 |

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The entire disclosure for pension and other postretirement benefits.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS88 -Paragraph 63 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 8 -Subparagraph m -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 30 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-2 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph q -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  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