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Dividend Restrictions - Additional Information (Details) $ in Millions | Dec. 31, 2022 USD ($)
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First Mid Bank |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |
Amount Available for Dividend Distribution without Prior Approval from Regulatory Agency | $ 82.3

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=fmbh_FirstMidBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |