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Regulatory Restrictions (Narrative) (Details) (USD $)
Dec. 31, 2014
Regulatory Restrictions [Abstract]  
Undivided profits $ 196,633,000fbp_UndividedProfits
Restricted investment in bank 234,401,000fbp_RestrictedInvestmentInBank
Average reserve balance $ 472,000fbp_AverageReserveBalance