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Commitments, Contingencies, and Concentrations of Credit Risk (Schedule of Outstanding Loan Commitments) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Outstanding closed-end loan commitments | $ 681
Unfunded commitments on revolving lines of credit, credit cards and home equity loans | 657
Commitments, total | 1,338
Fixed Rate [Member] |
Outstanding closed-end loan commitments | 225
Unfunded commitments on revolving lines of credit, credit cards and home equity loans | 144
Commitments, total | 369
Variable Rate [Member] |
Outstanding closed-end loan commitments | 456
Unfunded commitments on revolving lines of credit, credit cards and home equity loans | 513
Commitments, total | $ 969

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- Definition The total amount of off-balance sheet lending-related financial instruments (e.g., commitments), which represents the maximum possible credit risk should the counterparty draw upon the commitment. + References No definition available. + Details
Name: | fbp_CommitmentsTotal
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The off-balance sheet contractual amount of lending-related commitments for closed-end loans. + References No definition available. + Details
Name: | fbp_OutstandingClosedendLoanCommitments
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The off-balance sheet amount of unfunded revolving lines of credit, credit cards and home equity loan commitments. + References No definition available. + Details
Name: | fbp_UnfundedCommitmentsOnRevolvingLinesOfCreditCreditCardsAndHomeEquityLoans
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=fbp_FixedRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=fbp_VariableRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |