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Loans and Asset Quality Information (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Covered purchased nonimpaired loans: |  |
Carrying amount of nonimpaired covered loans, beginning balance | $ 277,489 | $ 353,370
Principal repayments | (14,595) | (51,582)
Transfers to foreclosed real estate | (2,701) | (30,181)
Loan charge-offs | (5,109) | (10,584)
Accretion of loan discount | 3,658 | 16,466
Balance, ending, carrying value | $ 258,742 | $ 277,489

X
- Definition The increase in the net discounted value of 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

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 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