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Loans and Allowance for Credit Losses - Financial Effect of Loan Modifications (Details) | 3 Months Ended
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Sep. 30, 2023
Commercial and Industrial Loans |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Weighted Average Interest Rate Reduction | 4.75%
Weighted Average Term Extension (in months) | 5 months 3 days
Consumer Loans |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Weighted Average Interest Rate Reduction | 0.00%
Weighted Average Term Extension (in months) | 3 months

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- Definition Financing receivable, loan modifications weighted average interest rate reduction. + References No definition available. + Details
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- Definition Financing receivable, loan modifications weighted average term extension. + References No definition available. + Details
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Namespace Prefix: | fmbh_
Data Type: | xbrli:durationItemType
Balance Type: | na
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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_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |