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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Schedule of Repurchase Agreement Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Repurchase Agreement [Line Items]    
Securities Sold Under Agreements To Repurchase $ 900,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase [1] $ 900,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase [1]
Less than three years    
Repurchase Agreement [Line Items]    
Securities Sold Under Agreements To Repurchase 500,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= fbp_SecuritiesSoldUnderAgreementsToRepurchaseMatureLessThanThreeYearsMember		  
Over five years    
Repurchase Agreement [Line Items]    
Securities Sold Under Agreements To Repurchase $ 400,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= fbp_SecuritiesSoldUnderAgreementsToRepurchaseMatureOverFiveYearsMember		  
[1] As of March 31, 2015, includes $800 million with an average rate of 2.71% that lenders have the right to call before their contractual maturities at various dates beginning on April 9, 2015. Subsequent to April 9, 2015, no lender has exercised its call option on repurchase agreements. In addition, $700 million is tied to variable rates.