XML 152 R137.htm IDEA: XBRL DOCUMENT v3.10.0.1

Regulatory Restrictions and Capital Adequacy Regulatory Restrictions and Capital Adequacy - Additional Items (Details) $ in Millions	May 21, 2018 USD ($)
Additional Items [Abstract]
Subordinated Long-term Debt, Noncurrent	$ 100

X

- Definition

Additional Items [Abstract]

+ References

No definition available.

+ Details

Name:	fcf_AdditionalItemsAbstract
Namespace Prefix:	fcf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying value as of the balance sheet date of collateralized/uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Subordinated debt places a lender in a lien position behind the primary lender of the company.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_SubordinatedLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant