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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Realized Investment Gains (Losses) [Abstract]
Proceeds from sales	$ 343,610	$ 36,257	$ 611
Gross gains	4,381	202	124
Gross losses	(998)	(169)	0
Income tax expense	$ 981	$ (10)	$ 36

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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Balance Type:	debit
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X

- Definition

Debt and equity securities available for sale realized gain.

+ References

No definition available.

+ Details

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X

- Definition

Debt and equity securities available for sale realized loss.

+ References

No definition available.

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Namespace Prefix:	fmbh_
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X

- Definition

Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-9

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-11

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- References

No definition available.

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