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DEPOSITS - Brokered Certificates Of Deposit Mature (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered $ 2,887,046us-gaap_InterestBearingDomesticDepositBrokered $ 3,142,023us-gaap_InterestBearingDomesticDepositBrokered
Brokered Certificates Of Deposit Mature In One To Ninety Days [Member]    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered 361,594us-gaap_InterestBearingDomesticDepositBrokered
/ fbp_BrokeredDepositsAxis
= fbp_BrokeredCertificatesOfDepositMatureInOneToNinetyDaysMember		  
Brokered Certificates Of Deposit Mature In Over Ninety Days To One Year [Member]    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered 1,473,840us-gaap_InterestBearingDomesticDepositBrokered
/ fbp_BrokeredDepositsAxis
= fbp_BrokeredCertificatesOfDepositMatureInOverNinetyDaysToOneYearMember		  
Brokered Certificates Of Deposit Mature In One To Three Years [Member]    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered 956,783us-gaap_InterestBearingDomesticDepositBrokered
/ fbp_BrokeredDepositsAxis
= fbp_BrokeredCertificatesOfDepositMatureInOneToThreeYearsMember		  
BrokeredCertificatesOfDepositMatureInThreeToFiveYears [Member]    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered 58,795us-gaap_InterestBearingDomesticDepositBrokered
/ fbp_BrokeredDepositsAxis
= fbp_BrokeredcertificatesofdepositmatureinthreetofiveyearsMember		  
BrokeredCertificatesOfDepositMatureInOverFiveYears [Member]    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered $ 36,034us-gaap_InterestBearingDomesticDepositBrokered
/ fbp_BrokeredDepositsAxis
= fbp_BrokeredcertificatesofdepositmatureinoverfiveyearsMember