XML 60 R50.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Loans and Allowance for Credit Losses - Summary of Purchased Credit Deteriorated (PCD) Loans (Details) - USD ($) $ in Thousands | Feb. 14, 2022 | Feb. 22, 2021
--- | --- | ---
Delta Bancshares Company |  |
Summary Of Purchased Credit Deteriorated Loans [Line Items] |  |
Purchase price of purchase credit deteriorated loans at acquisition | $ 18,796 |
Allowance for credit losses at acquisition | (863) |
Non-credit discount/(premium) at acquisition | (523) |
Fair value of purchased credit deteriorated loans at acquisition | $ 17,410 |
LINCO Bancshares, Inc. |  |
Summary Of Purchased Credit Deteriorated Loans [Line Items] |  |
Purchase price of purchase credit deteriorated loans at acquisition |  | $ 64,647
Allowance for credit losses at acquisition |  | (2,074)
Non-credit discount/(premium) at acquisition |  | (187)
Fair value of purchased credit deteriorated loans at acquisition |  | $ 62,386

X
- Definition Summary of purchased credit deteriorated loans. + References No definition available. + Details
Name: | fmbh_SummaryOfPurchasedCreditDeterioratedLoansLineItems
Namespace Prefix: | fmbh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447 + Details
Name: | us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount at par value of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447 + Details
Name: | us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount at purchase price of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447 + Details
Name: | us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447 + Details
Name: | us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=fmbh_DeltaBancsharesCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=fmbh_LINCOBancsharesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |