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v3.20.4

Subsequent Events (Details) - Subsequent event | Jan. 27, 2021 USD ($) shares
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Subsequent Event [Line Items] |
Stock authorized to be repurchased (in shares) | shares | 3,333,000
Stock authorized to be repurchased (in shares) | $ | $ 100,000,000
Share Repurchase Program ,Percentage Of Outstanding Shares Authorized | 6.00%

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- Definition Share Repurchase Program, Percentage Of Outstanding Shares Authorized + References No definition available. + Details
Name: | frme_ShareRepurchaseProgramPercentageOfOutstandingSharesAuthorized
Namespace Prefix: | frme_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |