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Regulatory Restrictions (Schedule of Capital Ratios) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Company [Member]
Total capital ratio, actual	$ 393,480us-gaap_Capital / dei_LegalEntityAxis = fbp_CompanyMember	$ 374,480us-gaap_Capital / dei_LegalEntityAxis = fbp_CompanyMember
Tier I capital ratio, actual	365,384us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fbp_CompanyMember	346,353us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fbp_CompanyMember
Leverage ratio, actual	365,384us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fbp_CompanyMember	346,353us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fbp_CompanyMember
Total capital ratio, for capital adequacy purposes	178,811us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_CompanyMember	178,270us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_CompanyMember
Tier I capital ratio, for capital adequacy purposes	89,406us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_CompanyMember	89,135us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_CompanyMember
Leverage ratio, for capital adequacy purposes	125,856us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_CompanyMember	123,959us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_CompanyMember
Total capital ratio, actual	17.60%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fbp_CompanyMember	16.79%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fbp_CompanyMember
Tier I capital ratio, actual	16.35%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fbp_CompanyMember	15.53%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fbp_CompanyMember
Leverage ratio, actual	11.61%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fbp_CompanyMember	11.18%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fbp_CompanyMember
Total capital ratio, for capital adequacy purposes	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fbp_CompanyMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fbp_CompanyMember
Tier I capital ratio, for capital adequacy purposes	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fbp_CompanyMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fbp_CompanyMember
Leverage ratio, for capital adequacy purposes	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fbp_CompanyMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fbp_CompanyMember
Bank [Member]
Total capital ratio, actual	391,216us-gaap_Capital / dei_LegalEntityAxis = fbp_BankMember	371,765us-gaap_Capital / dei_LegalEntityAxis = fbp_BankMember
Tier I capital ratio, actual	363,141us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fbp_BankMember	343,659us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fbp_BankMember
Leverage ratio, actual	363,141us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fbp_BankMember	343,659us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fbp_BankMember
Total capital ratio, for capital adequacy purposes	178,679us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_BankMember	178,128us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_BankMember
Tier I capital ratio, for capital adequacy purposes	89,339us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_BankMember	89,064us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_BankMember
Leverage ratio, for capital adequacy purposes	125,784us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_BankMember	123,878us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fbp_BankMember
Total capital ratio, to be well capitalized under prompt corrective action provisions	223,348us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fbp_BankMember	222,661us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fbp_BankMember
Tier I capital ratio, to be well capitalized under prompt corrective action provisions	134,009us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fbp_BankMember	133,596us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fbp_BankMember
Leverage ratio, to be well capitalized under prompt corrective action provisions	$ 157,229us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fbp_BankMember	$ 154,847us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fbp_BankMember
Total capital ratio, actual	17.52%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember	16.69%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember
Tier I capital ratio, actual	16.26%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember	15.42%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember
Leverage ratio, actual	11.55%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fbp_BankMember	11.10%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fbp_BankMember
Total capital ratio, for capital adequacy purposes	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember
Tier I capital ratio, for capital adequacy purposes	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember
Leverage ratio, for capital adequacy purposes	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fbp_BankMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fbp_BankMember
Total capital ratio, to be well capitalized under prompt corrective action provisions	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember
Tier I capital ratio, to be well capitalized under prompt corrective action provisions	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fbp_BankMember
Leverage ratio, to be well capitalized under prompt corrective action provisions	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fbp_BankMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fbp_BankMember

X

- Definition

The amount of total capital as defined in the regulations.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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