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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Securities Available for Sale - Amortized Cost |  |
Due within one year |  |
Due after one year but within five years | 27,546 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost |
Due after five years but within ten years |  |
Due after ten years | 1,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost |
Mortgage-backed securities | 130,073 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost |
Total debt securities | 158,619 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |
Equity securities | 6,105 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis |
Total securities | 164,724 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 175,061 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Securities Available for Sale - Fair Value |  |
Due within one year |  |
Due after one year but within five years | 27,521 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
Due after five years but within ten years |  |
Due after ten years | 865 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue |
Mortgage-backed securities | 129,510 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue |
Total debt securities | 157,896 us-gaap_AvailableForSaleSecuritiesDebtSecurities |
Equity securities | 6,138 us-gaap_AvailableForSaleSecuritiesEquitySecurities |
Total securities | 164,034 us-gaap_AvailableForSaleSecurities | 173,041 us-gaap_AvailableForSaleSecurities
Securities Held to Maturity - Amortized Cost |  |
Due within one year | 100 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount |
Due after one year but within five years | 10,829 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount |
Due after five years but within ten years | 38,385 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount |
Due after ten years | 4,449 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount |
Mortgage-backed securities | 124,924 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount |
Total debt securities | 178,687 us-gaap_HeldToMaturitySecurities | 53,995 us-gaap_HeldToMaturitySecurities
Total securities | 178,687 us-gaap_MarketableSecurities |
Securities Held to Maturity - Fair Value |  |
Due within one year | 103 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue |
Due after one year but within five years | 11,539 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue |
Due after five years but within ten years | 41,190 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue |
Due after ten years | 4,718 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue |
Mortgage-backed securities | 124,861 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue |
Total debt securities | 182,411 fbp_TotalDebtSecurities |
Securities held to maturity | $ 182,411 us-gaap_HeldToMaturitySecuritiesFairValue | $ 56,700 us-gaap_HeldToMaturitySecuritiesFairValue

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- Definition Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing after the tenth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(4) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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