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Loans and Asset Quality Information (Schedule of Covered Purchased Nonimpaired Loans) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Covered purchased nonimpaired loans: |  |
Carrying amount of nonimpaired covered loans, beginning balance | $ 125,644 fbp_NonimpairedPurchasedLoansCarryingValue | $ 207,167 fbp_NonimpairedPurchasedLoansCarryingValue
Principal repayments | (8,942)fbp_PrincipalRepayments | (50,183)fbp_PrincipalRepayments
Transfers to foreclosed real estate | (505)fbp_TransfersToForeclosedRealEstate | (5,061)fbp_TransfersToForeclosedRealEstate
Transfers to non-covered loans due to expiration of loss-share agreement |  | (38,987)fbp_TransfersToNonCoveredLoans
Net loan (charge-offs) / recoveries | 213 fbp_LoanChargeoffs | (3,301)fbp_LoanChargeoffs
Accretion of loan discount | 1,557 fbp_AccretionOfLoanDiscount | 16,009 fbp_AccretionOfLoanDiscount
Balance, ending, carrying value | $ 117,967 fbp_NonimpairedPurchasedLoansCarryingValue | $ 125,644 fbp_NonimpairedPurchasedLoansCarryingValue

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- Definition Theaccrection of the discount on loans. + References No definition available. + Details
Name: | fbp_AccretionOfLoanDiscount
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | fbp_CoveredPurchasedNonimpairedLoansAbstract
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of write-off of the allowance for loans. + References No definition available. + Details
Name: | fbp_LoanChargeoffs
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate gross carrying amount of non impaired loans acquired. + References No definition available. + Details
Name: | fbp_NonimpairedPurchasedLoansCarryingValue
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The cash inflow associated with maturities (principal being due), and repayments of loans. + References No definition available. + Details
Name: | fbp_PrincipalRepayments
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The value of loans transfered to foreclosed assets. + References No definition available. + Details
Name: | fbp_TransfersToForeclosedRealEstate
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The value of loans transferred to non-covered loans due to expiration of the loss-share agreement. + References No definition available. + Details
Name: | fbp_TransfersToNonCoveredLoans
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration