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Loans and Asset Quality Information (Schedule of Covered Purchased Nonimpaired Loans) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2016 USD ($)
Covered purchased nonimpaired loans: |
Carrying amount of nonimpaired covered loans, beginning balance | $ 101,252
Principal repayments | (7,997)
Transfers to foreclosed real estate | (1,036)
Net loan recoveries | 1,784
Accretion of loan discount | 1,908
Transfer to non-covered loans due to expiration of loss-share agreement, April 1, 2016 | (17,530)
Transfer to non-covered loans due to termination of loss-share agreements, September 22, 2016 | (78,381)
Carrying amount of nonimpaired covered loans, ending balance |

X
- Definition Accretion of loan discount on covered purchased nonimpaired 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

X
- 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

X
- 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 Transfer to non-covered loans due to expiration of loss-share agreement. + References No definition available. + Details
Name: | fbp_TransferToNoncoveredLoansDueToExpirationOfLossshareAgreement
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Transfer to non-covered loans due to termination of loss-share agreements. + References No definition available. + Details
Name: | fbp_TransferToNoncoveredLoansDueToTerminationOfLossshareAgreements
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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