XML 62 R55.htm IDEA: XBRL DOCUMENT v3.25.3

Loans and Allowance for Credit Losses - Performance of Loans Modified (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	$ 0	$ 0
30-59 Days Past Due | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
30-59 Days Past Due | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	1,228	96
60-89 Days Past Due | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	505	0
60-89 Days Past Due | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	96
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	116
90 Days or More Past Due | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
90 Days or More Past Due | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	116
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	1,228	212
Total Past Due | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	505	0
Total Past Due | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	212
Commercial Real Estate | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
Commercial Real Estate | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	505	0
Commercial Real Estate | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
Commercial Real Estate | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	505	0
Commercial and Industrial Loans | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
Commercial and Industrial Loans | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	723	0
Commercial and Industrial Loans | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
Commercial and Industrial Loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	$ 723	$ 0

X

- Definition

Financing receivable modifications performance recorded investment.

+ References

No definition available.

+ Details

Name:	fmbh_FinancingReceivableModificationsPerformanceRecordedInvestment
Namespace Prefix:	fmbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=fmbh_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: