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Shareholders' Equity Transactions (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2013
Stock issued $ 70,000us-gaap_StockIssuedDuringPeriodValueNewIssues $ 26,392,000us-gaap_StockIssuedDuringPeriodValueNewIssues      
Small Business Lending Fund [Member]          
Stock issued     63,500,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
   
Stock issued, shares     63,500us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
   
Liquidation value of shares     $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
   
Preferred stock dividend rate       5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
 
Preferred stock dividend rate after five years       9.00%fbp_PreferredStockDividendRateAfterFiveYears
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
 
Threshold for qualified community banks     10,000,000,000fbp_ThresholdForQualifiedCommunityBanks
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
   
Accrued dividends 635,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
2,751,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
    662,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
Series C Preferred Stock [Member]          
Stock issued, shares   728,706us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
     
Stock sold price per share   $ 10.00us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
     
Accrued dividends 233,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
58,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
    233,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Common Stock [Member]          
Stock issued $ 70,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 26,392,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Stock issued, shares 5,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
2,656,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember