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
Securities Available for Sale - Amortized Cost
Due within one year
Due after one year but within five years	27,546
Due after five years but within ten years
Due after ten years	1,000
Mortgage-backed securities	130,073
Total debt securities	158,619
Equity securities	6,105
Total securities	164,724	175,061
Securities Available for Sale - Fair Value
Due within one year
Due after one year but within five years	27,521
Due after five years but within ten years
Due after ten years	865
Mortgage-backed securities	129,510
Total debt securities	157,896
Equity securities	6,138
Total securities	164,034us-gaap_AvailableForSaleSecurities	173,041us-gaap_AvailableForSaleSecurities
Securities Held to Maturity - Amortized Cost
Due within one year	100
Due after one year but within five years	10,829
Due after five years but within ten years	38,385
Due after ten years	4,449
Mortgage-backed securities	124,924
Total debt securities	178,687us-gaap_HeldToMaturitySecurities	53,995us-gaap_HeldToMaturitySecurities
Total securities	178,687us-gaap_MarketableSecurities
Securities Held to Maturity - Fair Value
Due within one year	103
Due after one year but within five years	11,539
Due after five years but within ten years	41,190
Due after ten years	4,718
Mortgage-backed securities	124,861
Total debt securities	182,411fbp_TotalDebtSecurities
Securities held to maturity	$ 182,411	$ 56,700

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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.

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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)

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-Name Accounting Standards Codification

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-Section 50

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Fair value of held-to-maturity debt securities maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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Fair value of held-to-maturity debt securities maturing after the tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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Fair value of held-to-maturity debt securities maturing in the sixth through tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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Fair value of held-to-maturity debt securities maturing in the second through fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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Amount of held-to-maturity debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

+ References

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