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Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Additional Information [Abstract]
Management Fees, Incentive Revenue (Deprecated 2018-01-31)	$ 0.3
Brokerage Commissions Revenue	$ 3.9	$ 3.1

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- Definition

Additional Information [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	fcf_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Incentive Revenue

+ References

No definition available.

+ Details

Name:	fcf_IncentiveRevenue
Namespace Prefix:	fcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Amount of commission revenue from buying and selling securities on behalf of customers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

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Period Type:	duration