| **Regulatory Capital (Details) (USD $)In Thousands, unless otherwise specified**           | Dec. 31, 2013 | Dec. 31, 2012 |
|--------------------------------------------------------------------------------------------|---------------|---------------|
| **Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]** |          |          |
| Total Capital (to Risk-weighted Assets), Actual Amount                                     | $ 599,966     | $ 526,792     |
| Total Capital (to Risk-weighted Assets) Actual Ratio                                       | 14.54%        | 16.34%        |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount              | 330,107       | 257,927       |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio               | 8.00%         | 8.00%         |
| Tier I Capital (to Risk-weighted Assets), Actual Amount                                    | 483,186       | 456,132       |
| Tier I Capital (to Risk-weighted Assets), Ratio                                            | 11.71%        | 14.15%        |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount             | 165,053       | 128,964       |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio              | 4.00%         | 4.00%         |
| Tier I Capital (to Average Assets), Actual                                                 | 483,186       | 456,132       |
| Tier I Capital (to Average Assets), Ratio                                                  | 10.20%        | 11.03%        |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Amount                   | 189,485       | 165,460       |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Ratio                    | 4.00%         | 4.00%         |
| First Merchants Bank                                                                       |          |          |
| **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                                     | 599,272       | 515,337       |
| Total Capital (to Risk-weighted Assets) Actual Ratio                                       | 14.56%        | 16.01%        |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount              | 329,344       | 257,446       |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio               | 8.00%         | 8.00%         |
| Tier I Capital (to Risk-weighted Assets), Actual Amount                                    | 547,655       | 474,782       |
| Tier I Capital (to Risk-weighted Assets), Ratio                                            | 13.30%        | 14.75%        |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount             | 164,672       | 128,723       |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio              | 4.00%         | 4.00%         |
| Tier I Capital (to Average Assets), Actual                                                 | 547,655       | 474,782       |
| Tier I Capital (to Average Assets), Ratio                                                  | 11.58%        | 11.50%        |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Amount                   | $ 189,095     | $ 165,124     |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Ratio                    | 4.00%         | 4.00%         |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of total capital as defined in the regulations.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.
+ References
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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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total Capital divided by risk weighted assets as defined in the regulations.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.
+ References
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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.
+ References
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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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tier 1 Leverage Capital divided by average assets as defined in the regulations.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tier 1 Risk Based Capital as defined in the regulations.
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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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tier 1 capital divided by risk weighted assets as defined by regulations.
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