| **Regulatory Capital and Dividends - Schedule of Actual and Required Capital (Details) - USD ($) $ in Thousands**       | Dec. 31, 2017 | Dec. 31, 2016 |
|-------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Total Risk-Based Capital**                                                                                            |          |          |
| Actual                                                                                                                  | $ 1,048,757   | $ 851,521     |
| Prompt Corrective Action Thresholds, Adequate Capital                                                                   | 612,848       | 479,470       |
| **Tier 1 Capital to Risk-weighted Assets, Amount**                                                                      |          |          |
| Actual                                                                                                                  | 908,725       | 720,484       |
| Prompt Corrective Action Thresholds, Adequate Capital                                                                   | 459,636       | 359,603       |
| **Common Equity Tier One Capital to Risk-weighted Assets, Amount**                                                      |          |          |
| Actual                                                                                                                  | 842,806       | 665,445       |
| Prompt Corrective Action Thresholds, Adequate Capital                                                                   | 344,727       | 269,702       |
| **Tier I Capital to Average Assets, Amount**                                                                            |          |          |
| Actual                                                                                                                  | 908,725       | 720,484       |
| Prompt Corrective Action Thresholds, Adequate Capital                                                                   | $ 348,407     | $ 273,456     |
| **Risk Based Ratios**                                                                                                   |          |          |
| Total Capital to Risk-weighted Assets, Actual Ratio                                                                     | 13.69%        | 14.21%        |
| Total Capital to Risk-weighted Assets, Prompt Corrective Action Thresholds, Adequate Capital Ratio                      | 8.00%         | 8.00%         |
| Tier 1 Capital to Risk-Weighted Assets                                                                                  | 11.86%        | 12.02%        |
| Tier I Capital to Risk-weighted Assets, Prompt Corrective Action Thresholds, Adequate Capital Ratio                     | 6.00%         | 6.00%         |
| Common Equity Tier 1 Capital Ratio (Regulatory)                                                                         | 11.00%        | 11.10%        |
| Common Equity Tier 1 Capital to Risk-weighted Assets, Prompt Corrective Action Thresholds, Adequately Capitalized Ratio | 4.50%         | 4.50%         |
| **Leverage Ratios**                                                                                                     |          |          |
| Tier 1 Capital to Average Assets                                                                                        | 10.43%        | 10.54%        |
| Tier I Capital to Average Assets, Prompt Corrective Action Thresholds, Adequate Capital Ratio                           | 4.00%         | 4.00%         |
| First Merchants Bank                                                                                                    |          |          |
| **Total Risk-Based Capital**                                                                                            |          |          |
| Actual                                                                                                                  | $ 1,016,355   | $ 800,598     |
| Prompt Corrective Action Thresholds, Adequate Capital                                                                   | 617,477       | 481,490       |
| Prompt Corrective Action Thresholds, Well Capitalized                                                                   | 771,847       | 601,862       |
| **Tier 1 Capital to Risk-weighted Assets, Amount**                                                                      |          |          |
| Actual                                                                                                                  | 941,323       | 734,561       |
| Prompt Corrective Action Thresholds, Adequate Capital                                                                   | 463,108       | 361,117       |
| Prompt Corrective Action Thresholds, Well Capitalized                                                                   | 617,477       | 481,490       |
| **Common Equity Tier One Capital to Risk-weighted Assets, Amount**                                                      |          |          |
| Actual                                                                                                                  | 941,323       | 734,561       |
| Prompt Corrective Action Thresholds, Adequate Capital                                                                   | 347,331       | 270,838       |
| Prompt Corrective Action Thresholds, Well Capitalized                                                                   | 501,700       | 391,210       |
| **Tier I Capital to Average Assets, Amount**                                                                            |          |          |
| Actual                                                                                                                  | 941,323       | 734,561       |
| Prompt Corrective Action Thresholds, Adequate Capital                                                                   | 347,794       | 272,461       |
| Prompt Corrective Action Thresholds, Well Capitalized                                                                   | $ 434,742     | $ 340,576     |
| **Risk Based Ratios**                                                                                                   |          |          |
| Total Capital to Risk-weighted Assets, Actual Ratio                                                                     | 13.17%        | 13.30%        |
| Total Capital to Risk-weighted Assets, Prompt Corrective Action Thresholds, Adequate Capital Ratio                      | 8.00%         | 8.00%         |
| Total Capital to Risk-weighted Assets, Prompt Corrective Action Thresholds, Well Capitalized Ratio                      | 10.00%        | 10.00%        |
| Tier 1 Capital to Risk-Weighted Assets                                                                                  | 12.20%        | 12.20%        |
| Tier I Capital to Risk-weighted Assets, Prompt Corrective Action Thresholds, Adequate Capital Ratio                     | 6.00%         | 6.00%         |
| Tier I Capital to Risk-weighted Assets, Prompt Corrective Action Thresholds, Well Capitalized Ratio                     | 8.00%         | 8.00%         |
| Common Equity Tier 1 Capital Ratio (Regulatory)                                                                         | 12.20%        | 12.20%        |
| Common Equity Tier 1 Capital to Risk-weighted Assets, Prompt Corrective Action Thresholds, Adequately Capitalized Ratio | 4.50%         | 4.50%         |
| Common Equity Tier 1 Capital to Risk-weighted Assets, Prompt Corrective Action Thresholds, Well Capitalized Ratio       | 6.50%         | 6.50%         |
| **Leverage Ratios**                                                                                                     |          |          |
| Tier 1 Capital to Average Assets                                                                                        | 10.83%        | 10.78%        |
| Tier I Capital to Average Assets, Prompt Corrective Action Thresholds, Adequate Capital Ratio                           | 4.00%         | 4.00%         |
| Tier I Capital to Average Assets, Prompt Corrective Action Thresholds, Well Capitalized Ratio                           | 5.00%         | 5.00%         |

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Common Equity Tier One Risk Based Capital
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Common Equity Tier One Risk Based Capital Required for Capital Adequacy
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Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets
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The amount of common equity tier 1 risk based capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action
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The amount of common equity tier 1 divided by risk-weighted assets required to be categorized as well-capitalized under the regulatory framework for prompt corrective action.
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| - Definition
The amount of total capital as defined in the regulations.
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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.
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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.
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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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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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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.
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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.
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Tier 1 Leverage Capital divided by average assets as defined in the regulations.
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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.
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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.
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| - Definition
The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized 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
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| - Definition
Tier 1 capital divided by risk weighted assets as defined by regulations.
+ References
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