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STOCKHOLDERS' EQUITY - Exchange offer with respect to Series A through E preferred stock (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Class Of Stock [Line Items]      
Liquidation value per share   25us-gaap_PreferredStockLiquidationPreference  
Preferred stock, shares outstanding   1,444,146us-gaap_PreferredStockSharesOutstanding 1,444,146us-gaap_PreferredStockSharesOutstanding
Shares Of Preferred Stock Exchanged 249,477fbp_SharesOfPreferredStockExchanged    
Preferred Stock Value   36,104us-gaap_PreferredStockValue $ 36,104us-gaap_PreferredStockValue
Conversion Of Stock Shares Issued1 1,075,283us-gaap_ConversionOfStockSharesIssued1    
Series A Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage   7.125%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		  
Series B Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage   8.35%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		  
Series C Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage   7.40%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		  
Series D Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage   7.25%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		  
Series E Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock dividend rate percentage   7.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember