| **Regulatory Capital (Details) (USD $)In Thousands, unless otherwise specified**           | Dec. 31, 2014                                                                                                                        | Dec. 31, 2013                                                                                                                       |
|--------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------|
| **Capital [Abstract]**                                                                     |                                                                                                                                 |                                                                                                                                |
| Total Capital (to Risk-weighted Assets), Actual Amount                                     | $ 685,507us-gaap_Capital                                                                                                             | $ 599,966us-gaap_Capital                                                                                                            |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount              | 357,581us-gaap_CapitalRequiredForCapitalAdequacy                                                                                     | 330,107us-gaap_CapitalRequiredForCapitalAdequacy                                                                                    |
| **Tier One Risk Based Capital [Abstract]**                                                 |                                                                                                                                 |                                                                                                                                |
| Tier I Capital (to Risk-weighted Assets), Actual Amount                                    | 564,535us-gaap_TierOneRiskBasedCapital                                                                                               | 483,186us-gaap_TierOneRiskBasedCapital                                                                                              |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount             | 178,791us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy                                                                     | 165,053us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy                                                                    |
| **Tier One Leverage Capital [Abstract]**                                                   |                                                                                                                                 |                                                                                                                                |
| Tier I Capital (to Average Assets), Actual                                                 | 564,535us-gaap_TierOneLeverageCapital                                                                                                | 483,186us-gaap_TierOneLeverageCapital                                                                                               |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Amount                   | 222,533us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy                                                                      | 189,485us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy                                                                     |
| **Risk Based Ratios [Abstract]**                                                           |                                                                                                                                 |                                                                                                                                |
| Total Capital (to Risk-weighted Assets) Actual Ratio                                       | 15.34%us-gaap_CapitalToRiskWeightedAssets                                                                                            | 14.54%us-gaap_CapitalToRiskWeightedAssets                                                                                           |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio               | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets                                                                   | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets                                                                  |
| Tier I Capital (to Risk-weighted Assets), Ratio                                            | 12.63%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets                                                                            | 11.71%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets                                                                           |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio              | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets                                                   | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets                                                  |
| **Leverage Ratios [Abstract]**                                                             |                                                                                                                                 |                                                                                                                                |
| Tier I Capital (to Average Assets), Ratio                                                  | 10.15%us-gaap_TierOneLeverageCapitalToAverageAssets                                                                                  | 10.20%us-gaap_TierOneLeverageCapitalToAverageAssets                                                                                 |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Ratio                    | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets                                                         | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets                                                        |
| First Merchants Bank                                                                       |                                                                                                                                 |                                                                                                                                |
| **Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]** |                                                                                                                                 |                                                                                                                                |
| Total Capital (to Risk-weighted Assets) Well Capitalized Ratio                             | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                |                                                                                                                                |
| Tier I Capital (to Risk-weighted Assets) Well Capitalized Ratio                            | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember |                                                                                                                                |
| Tier I Capital (to Average Assets) Well Capitalized Ratio                                  | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember       |                                                                                                                                |
| **Capital [Abstract]**                                                                     |                                                                                                                                 |                                                                                                                                |
| Total Capital (to Risk-weighted Assets), Actual Amount                                     | 653,169us-gaap_Capital/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                                              | 599,272us-gaap_Capital/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                                             |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount              | 356,884us-gaap_CapitalRequiredForCapitalAdequacy/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                    | 329,344us-gaap_CapitalRequiredForCapitalAdequacy/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                   |
| **Tier One Risk Based Capital [Abstract]**                                                 |                                                                                                                                 |                                                                                                                                |
| Tier I Capital (to Risk-weighted Assets), Actual Amount                                    | 597,305us-gaap_TierOneRiskBasedCapital/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                              | 547,655us-gaap_TierOneRiskBasedCapital/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                             |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Amount             | 178,442us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                    | 164,672us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                   |
| **Tier One Leverage Capital [Abstract]**                                                   |                                                                                                                                 |                                                                                                                                |
| Tier I Capital (to Average Assets), Actual                                                 | 597,305us-gaap_TierOneLeverageCapital/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                               | 547,655us-gaap_TierOneLeverageCapital/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                              |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Amount                   | $ 226,339us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                   | $ 189,095us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                  |
| **Risk Based Ratios [Abstract]**                                                           |                                                                                                                                 |                                                                                                                                |
| Total Capital (to Risk-weighted Assets) Actual Ratio                                       | 14.64%us-gaap_CapitalToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                           | 14.56%us-gaap_CapitalToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                          |
| Total Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio               | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                  | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                 |
| Tier I Capital (to Risk-weighted Assets), Ratio                                            | 13.39%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                           | 13.30%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                          |
| Tier I Capital (to Risk-weighted Assets) Required for Adequate Capital, Ratio              | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember  | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember |
| **Leverage Ratios [Abstract]**                                                             |                                                                                                                                 |                                                                                                                                |
| Tier I Capital (to Average Assets), Ratio                                                  | 10.56%us-gaap_TierOneLeverageCapitalToAverageAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                 | 11.58%us-gaap_TierOneLeverageCapitalToAverageAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember                                |
| Tier I Capital (to Average Assets) Required for Adequate Capital, Ratio                    | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember        | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets/ dei_LegalEntityAxis= us-gaap_SubsidiariesMember       |

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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.
+ 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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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
Reference 1: 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=35709795&loc=d3e65071-112826Reference 2: 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=35709795&loc=SL5958568-112826Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826
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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
Reference 1: 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=35709795&loc=SL5958568-112826
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tier 1 Leverage Capital divided by average assets as defined in the regulations.
+ References
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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
Reference 1: 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=35709795&loc=d3e65071-112826Reference 2: 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=35709795&loc=SL5958568-112826
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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
Reference 1: 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=35709795&loc=d3e65071-112826Reference 2: 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=35709795&loc=SL5958568-112826Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826
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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 FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tier 1 capital divided by risk weighted assets as defined by regulations.
+ References
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