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Investment Securities Narrative (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Investments [Line Items]      
Available-for-sale Securities Pledged as Collateral $ 1,600,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral   $ 1,700,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Amortized cost 2,237,100,000us-gaap_AvailableForSaleSecuritiesAmortizedCost   2,312,087,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Gross Realized Gain (Loss) 4,145,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet  
Available-for-sale Securities, Fair Value Disclosure 2,259,802,000us-gaap_AvailableForSaleSecurities   2,323,371,000us-gaap_AvailableForSaleSecurities
Single Bank Stock Investment, cost basis 15,700,000fult_SingleBankStockInvestmentcostbasis    
Single Bank Stock Investment, Fair Value 23,200,000fult_Bankstockinvestmentfairvalue    
Percent Ownership In An Individual Financial Institution 66.70%fult_PercentOwnershipInAnIndividualFinancialInstitution    
IndividualBankStockInvestmentPercenttoTotalPortfolio 5.00%fult_Individualbankstockinvestmentpercenttototalportfolio    
Auction Rate Certificates Not Subject To Any Additional Other Than Temporary Impairment Charges Fair Value 98,900,000fult_AuctionRateCertificatesNotSubjectToAnyAdditionalOtherThanTemporaryImpairmentChargesFairValue    
Domestic Corporate debt securities 97,700,000fult_DomesticCorporateDebtSecurities    
Equity Securities [Member]      
Schedule of Investments [Line Items]      
Amortized cost 29,224,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  33,469,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Available-for-sale Securities, Gross Realized Gain (Loss) 1,970,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
1,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Available-for-sale Securities, Fair Value Disclosure 40,608,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  47,623,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Equity Securities Financial Institution [Member]      
Schedule of Investments [Line Items]      
Available-for-sale Securities, Equity Securities 34,700,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_EquitySecuritiesFinancialInstitutionMember
  41,800,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_EquitySecuritiesFinancialInstitutionMember
Amortized cost 23,400,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_EquitySecuritiesFinancialInstitutionMember
   
Available-for-sale Securities, Fair Value Disclosure 34,700,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_EquitySecuritiesFinancialInstitutionMember
   
Equity Securities, Other [Member]      
Schedule of Investments [Line Items]      
Available-for-sale Securities, Equity Securities 5,900,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_OtherEquitySecuritiesMember
  5,800,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_OtherEquitySecuritiesMember
Auction Rate Securities [Member]      
Schedule of Investments [Line Items]      
Amortized cost 106,410,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
  108,751,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
Available-for-sale Securities, Fair Value Disclosure 98,932,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
  100,941,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
Pooled Trust Preferred Securities [Member]      
Schedule of Investments [Line Items]      
Amortized cost 1,500,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_PooledTrustPreferredSecuritiesMember
   
Available-for-sale Securities, Gross Realized Gain (Loss) 2,200,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_PooledTrustPreferredSecuritiesMember
   
Number of Securities Sold 2fult_NumberofSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_PooledTrustPreferredSecuritiesMember
   
Single-issuer Trust Preferred Securities [Member]      
Schedule of Investments [Line Items]      
Unrealized Loss on Securities 4,700,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_SingleIssuerTrustPreferredSecuritiesMember
   
Number of Trust Preferred Securities 20fult_NumberofTrustPreferredSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_SingleIssuerTrustPreferredSecuritiesMember
   
Number of Trust Preferred Securities Not Rated 3fult_NumberofTrustPreferredSecuritiesNotRated
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_SingleIssuerTrustPreferredSecuritiesMember
   
Moody's, A2 Rating [Member] | Auction Rate Securities [Member]      
Schedule of Investments [Line Items]      
Carrying Value Auction Rate Securities Rated Investment Grade 93,000,000fult_CarryingValueAuctionRateSecuritiesRatedInvestmentGrade
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysA2RatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
   
Percentage Auction Rate Securities Investment Grade 95.00%fult_PercentageAuctionRateSecuritiesInvestmentGrade
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysA2RatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
   
Moody's, A3 Rating [Member] | Auction Rate Securities [Member]      
Schedule of Investments [Line Items]      
Carrying Value Auction Rate Securities Rated Investment Grade 6,000,000fult_CarryingValueAuctionRateSecuritiesRatedInvestmentGrade
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysA3RatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
   
Percentage Auction Rate Securities Investment Grade 5.00%fult_PercentageAuctionRateSecuritiesInvestmentGrade
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysA3RatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
   
External Credit Rating, BBB [Member] | Single-issuer Trust Preferred Securities [Member]      
Schedule of Investments [Line Items]      
Amortized cost 4,700,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingMoodysAxis
= fult_ExternalCreditRatingBbbMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_SingleIssuerTrustPreferredSecuritiesMember
   
Available-for-sale Securities, Fair Value Disclosure 3,800,000us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingMoodysAxis
= fult_ExternalCreditRatingBbbMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_SingleIssuerTrustPreferredSecuritiesMember
   
External Credit Rating, Rated Below Investment Grade [Member] | Pooled Trust Preferred Securities [Member]      
Schedule of Investments [Line Items]      
Amortized cost 405,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_ExternalCreditRatingByGroupingAxis
= fult_ExternalCreditRatingRatedBelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_PooledTrustPreferredSecuritiesMember
   
Available-for-sale Securities, Fair Value Disclosure 1,100,000us-gaap_AvailableForSaleSecurities
/ us-gaap_ExternalCreditRatingByGroupingAxis
= fult_ExternalCreditRatingRatedBelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_PooledTrustPreferredSecuritiesMember
   
Number of Trust Preferred Securities 3fult_NumberofTrustPreferredSecurities
/ us-gaap_ExternalCreditRatingByGroupingAxis
= fult_ExternalCreditRatingRatedBelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_PooledTrustPreferredSecuritiesMember
   
External Credit Rating, Rated Below Investment Grade [Member] | Single-issuer Trust Preferred Securities [Member]      
Schedule of Investments [Line Items]      
Amortized cost 14,500,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_ExternalCreditRatingByGroupingAxis
= fult_ExternalCreditRatingRatedBelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_SingleIssuerTrustPreferredSecuritiesMember
   
Available-for-sale Securities, Fair Value Disclosure $ 12,800,000us-gaap_AvailableForSaleSecurities
/ us-gaap_ExternalCreditRatingByGroupingAxis
= fult_ExternalCreditRatingRatedBelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_SingleIssuerTrustPreferredSecuritiesMember
   
Number of Trust Preferred Securities 7fult_NumberofTrustPreferredSecurities
/ us-gaap_ExternalCreditRatingByGroupingAxis
= fult_ExternalCreditRatingRatedBelowInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fult_SingleIssuerTrustPreferredSecuritiesMember