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REGULATORY MATTERS - Additional Information (Details) $ in Millions	Dec. 31, 2025 USD ($)
Banking and Thrift, Other Disclosure [Abstract]
Retained earnings available for distribution	$ 771.3
Maximum amount loans that corporation can borrower under current provisions	$ 1,000.0

X

- Definition

The maximum aggregate amount that may be borrowed from the bank affiliate by non-banking affiliates.

+ References

No definition available.

+ Details

Name:	fnb_LoansToAffiliateAmountMaximum
Namespace Prefix:	fnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_BankingAndThriftOtherDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

No definition available.

+ Details

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