| **Regulatory Capital (Details) (USD $)In Thousands, unless otherwise specified**           | Dec. 31, 2012 | Dec. 31, 2011 |
|--------------------------------------------------------------------------------------------|---------------|---------------|
| **Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]** |          |          |
| Total Capital (to Risk-weighted Assets), Actual Amount                                     | $ 526,792     | $ 487,393     |
| Total Capital (to Risk-weighted Assets) Actual Ratio                                       | 16.34%        | 16.54%        |
| Total Capital (to RIsk-weighted Assets) Required for Adequate Capital, Amount              | 257,927       | 235,781       |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio               | 8.00%         | 8.00%         |
| Tier I Capital (to Risk-weighted Assets), Actual Amount                                    | 456,132       | 410,132       |
| Tier I Capital (to Risk-weighted Assets), Ratio                                            | 14.15%        | 13.92%        |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount             | 128,964       | 117,890       |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio              | 4.00%         | 4.00%         |
| Tier I Capital (to Average Assets), Actual                                                 | 456,132       | 410,132       |
| Tier I Capital (to Average Assets), Ratio                                                  | 11.03%        | 10.17%        |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Amount                   | 165,460       | 161,350       |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Ratio                    | 4.00%         | 4.00%         |
| First Merchants                                                                            |          |          |
| **Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]** |          |          |
| Total Capital (to Risk-weighted Assets) Well Capitalized Ratio                             | 10.00%        |          |
| Tier I Capital (to Risk-weighted Assets) Well Capitalized Ratio                            | 6.00%         |          |
| Tier I Capital (to Average Assets) Well Capitalized Ratio                                  | 5.00%         |          |
| Total Capital (to Risk-weighted Assets), Actual Amount                                     | 515,337       | 477,805       |
| Total Capital (to Risk-weighted Assets) Actual Ratio                                       | 16.01%        | 16.26%        |
| Total Capital (to RIsk-weighted Assets) Required for Adequate Capital, Amount              | 257,446       | 235,089       |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio               | 8.00%         | 8.00%         |
| Tier I Capital (to Risk-weighted Assets), Actual Amount                                    | 474,782       | 440,909       |
| Tier I Capital (to Risk-weighted Assets), Ratio                                            | 14.75%        | 15.00%        |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount             | 128,723       | 117,545       |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio              | 4.00%         | 4.00%         |
| Tier I Capital (to Average Assets), Actual                                                 | 474,782       | 440,909       |
| Tier I Capital (to Average Assets), Ratio                                                  | 11.50%        | 10.96%        |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Amount                   | $ 165,124     | $ 160,848     |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Ratio                    | 4.00%         | 4.00%         |

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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of total capital as defined in the regulations.
+ References
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| - Definition
The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.
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| - Definition
The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.
+ References
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| - Definition
The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.
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| - Definition
Total Capital divided by risk weighted assets as defined in the regulations.
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| - Definition
Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.
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| - Definition
The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.
+ References
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| - Definition
Tier 1 Leverage Capital divided by average assets as defined in the regulations.
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| - Definition
Tier 1 Risk Based Capital as defined in the regulations.
+ References
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| - Definition
The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.
+ References
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| - Definition
The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 15 -Subparagraph 3a -IssueDate 2006-05-01 -Chapter 17 -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 AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 22 -IssueDate 2006-05-01 -Chapter 17 -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.
+ Details**Name:**us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tier 1 capital divided by risk weighted assets as defined by regulations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 22 -IssueDate 2006-05-01 -Chapter 17 -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 Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 15 -Subparagraph 3a -IssueDate 2006-05-01 -Chapter 17 -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 Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826
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