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Investment Securities - Schedule of Proceeds From Sales of Available for Sale Investment Securities, Realized Gains and Losses and Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Realized Investment Gains (Losses) [Abstract]
Proceeds from sales	$ 8,864	$ 60,900	$ 13,152
Gross gains	1,132	875	941
Gross losses	(26)	(73)	(40)
Income tax expense	$ 321	$ 233	$ 261

X

- Definition

This item represents the net income tax expense (benefit) on the gain or loss resulting from the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Debt and equity securities available for sale realized gain.

+ References

No definition available.

+ Details

Name:	fmbh_DebtAndEquitySecuritiesAvailableForSaleRealizedGain
Namespace Prefix:	fmbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Debt and equity securities available for sale realized loss.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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