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Loans and Asset Quality Information (Schedule of Covered Purchased Nonimpaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Covered purchased nonimpaired loans: |  |
Carrying amount of nonimpaired covered loans, beginning balance | $ 101,252 | $ 125,644
Principal repayments | (3,975) | (30,238)
Transfers to foreclosed real estate | (869) | (1,211)
Net loan (charge-offs) / recoveries | 893 | 2,306
Accretion of loan discount | 1,055 | 4,751
Balance, ending, carrying value | $ 98,356 | $ 101,252

X
- 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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- References No definition available. + 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

X
- 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