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Shareholders' Equity Transactions (Narrative) (Details) (USD $)
12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2011
Mar. 31, 2015
Dec. 31, 2012
Mar. 31, 2014
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 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   159,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
  159,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
Small Business Lending Fund [Member] | Minimum [Member]        
Preferred stock dividend rate   1.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsidiarySaleOfStockAxis
= fbp_SmallBusinessLendingFundMember
   
Small Business Lending Fund [Member] | Maximum [Member]        
Preferred stock dividend rate   5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ 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   58,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
  $ 58,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Common Stock [Member]        
Stock issued, shares     2,656,294us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember