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Restrictions on Cash and Cash Equivalents (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Cash and Cash Equivalents [Abstract] |  |
Collateral | $ 269.6 | $ 408.1

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- Definition Derivatives And Other Contracts, Collateral, Right To Reclaim Cash + References No definition available. + Details
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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