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Fair Value of Financial Instruments (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value Of Financial Instruments [Abstract] |  |  |
Increase (decrease) in fair value of securities available for sale | $ 1,329,000 fbp_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax1 | $ (5,311,000)fbp_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax1 |
Tax benefit (expense) of increase in the fair value of securities available for sale | 518,000 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent | (2,072,000)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent |
Write-down of noncovered foreclosed properties |  |  | $ 10,600,000 fbp_WritedownOfNoncoveredForeclosedProperties
Percentage reduction in carrying value |  |  | 29.00%fbp_PercentageReductionInCarryingValue

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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References No definition available. + Details
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- Definition The percentage reduction in carrying value relating to the writedown of noncovered foreclosed properties. + References No definition available. + Details
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- Definition The amount of noncovered foreclosed properties written down. + References No definition available. + Details
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- Definition Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 + Details
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