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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Purchased impaired loans (substantially all of which are covered loans) |  |
Balance, beginning, carrying value | $ 1,970 | $ 2,597
Change due to payments received | (168) | (532)
Transfer to foreclosed real estate |  | $ (95)
Change due to loan charge-off | (70) |
Other |  |
Balance, ending, carrying value | 1,732 | $ 1,970
Contractual Principal Receivable [Member] |  |
Purchased impaired loans (substantially all of which are covered loans) |  |
Balance, beginning, contractual principal | 4,791 | 5,859
Change due to payments received | (879) | (634)
Transfer to foreclosed real estate |  | (431)
Change due to loan charge-off | (394) |
Other |  | (3)
Balance, ending, contractual principal | 3,518 | 4,791
Fair Value Adjustment Write Down [Member] |  |
Purchased impaired loans (substantially all of which are covered loans) |  |
Balance, beginning, FMV | 2,821 | 3,262
Change due to payments received | (711) | (102)
Transfer to foreclosed real estate |  | (336)
Change due to loan charge-off | (324) |
Other |  | (3)
Balance, ending, FMV | $ 1,786 | $ 2,821

X
- Definition Amount of change due to a loan write-off of the allowance for loans. + References No definition available. + Details
Name: | fbp_ChangeDueToLoanChargeoff
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The decrease in amounts due to payments received. + References No definition available. + Details
Name: | fbp_ChangeDueToPaymentsReceived
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of fair value adjustment write down (nonaccretabe difference) of contractual principal receiavble. + References No definition available. + Details
Name: | fbp_FairValueAdjustmentWriteDown
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired purchased loans with related allowance for credit losses and without related allowance for credit losses. + References No definition available. + Details
Name: | fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value of impaired purchased loans (includes covered and non-covered). + References No definition available. + Details
Name: | fbp_ImpairedPurchasedLoansCarryingValue
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other activity in amounts not disclosed elsewhere in taxonomy. + References No definition available. + Details
Name: | fbp_Other
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | fbp_PurchasedImpairedLoansSubstantiallyAllOfWhichAreCoveredLoansAbstract
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Balance Type: |
Period Type: |