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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 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 | (1,386) | (532)
Transfer to foreclosed real estate |  | (95)
Change due to loan charge-off | (70) |
Other |  |
Balance, ending, carrying value | 514 | 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 | (3,753) | (634)
Transfer to foreclosed real estate |  | (431)
Change due to loan charge-off | (428) |
Other |  | (3)
Balance, ending, contractual principal | 610 | 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 | (2,367) | (102)
Transfer to foreclosed real estate |  | (336)
Change due to loan charge-off | (358) |
Other |  | (3)
Balance, ending, FMV | $ 96 | $ 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
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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
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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
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- 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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Period Type: |