XML 58 R51.htm IDEA: XBRL DOCUMENT
v3.24.3

Loans and Allowance for Credit Losses - Amortized Cost Basis of Loans Experiencing Financial Difficulty and Modified (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Class of Financing Receivable | 0.05% | 0.05%
Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Class of Financing Receivable | 0.05% | 0.04%
Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Class of Financing Receivable | 0.00% | 0.00%
Agricultural Real Estate Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Class of Financing Receivable | 0.01% | 0.01%
Residential Properties | Real Estate Loan | 1-4 Family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Class of Financing Receivable | 0.01% | 0.02%
Commercial Real Estate | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Class of Financing Receivable | 0.03% | 0.02%
Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Class of Financing Receivable | 0.00% | 0.01%
Principal Forgiveness |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | $ 0 | $ 0
Principal Forgiveness | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Principal Forgiveness | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Principal Forgiveness | Agricultural Real Estate Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Principal Forgiveness | Residential Properties | Real Estate Loan | 1-4 Family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Principal Forgiveness | Commercial Real Estate | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Principal Forgiveness | Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Payment Delay Investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 1,387 | 1,385
Payment Delay Investment | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 1,233 | 1,160
Payment Delay Investment | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 3 | 7
Payment Delay Investment | Agricultural Real Estate Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 312 | 333
Payment Delay Investment | Residential Properties | Real Estate Loan | 1-4 Family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 47 | 57
Payment Delay Investment | Commercial Real Estate | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 874 | 770
Payment Delay Investment | Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 151 | 218
Term Extension Modifications |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 1,109 | 1,276
Term Extension Modifications | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 980 | 956
Term Extension Modifications | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 10 | 41
Term Extension Modifications | Agricultural Real Estate Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Term Extension Modifications | Residential Properties | Real Estate Loan | 1-4 Family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 768 | 819
Term Extension Modifications | Commercial Real Estate | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 212 | 137
Term Extension Modifications | Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 119 | 279
Interest Rate Reduction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 472 | 0
Interest Rate Reduction | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 472 | 0
Interest Rate Reduction | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Interest Rate Reduction | Agricultural Real Estate Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Interest Rate Reduction | Residential Properties | Real Estate Loan | 1-4 Family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 0 | 0
Interest Rate Reduction | Commercial Real Estate | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | 472 | 0
Interest Rate Reduction | Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Balance | $ 0 | $ 0

X
- Definition Financing Receivables, Modifications during Period, Balance + References No definition available. + Details
Name: | fmbh_FinancingReceivablesModificationsDuringPeriodBalance
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
- Definition Percentage of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
Name: | us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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_FinancingReceivablePortfolioSegmentAxis=fmbh_AgriculturalRealEstateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=fmbh_OneToFourFamilyMember
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: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_PrincipalForgivenessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ContractualInterestRateReductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |