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Restrictions on Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Cash and Cash Equivalents [Abstract]
Collateral	$ 27.3	$ 4.0

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- Definition

Derivatives And Other Contracts, Collateral, Right To Reclaim Cash

+ References

No definition available.

+ Details

Name:	fult_DerivativesAndOtherContractsCollateralRightToReclaimCash
Namespace Prefix:	fult_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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