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Loans and Asset Quality Information (Schedule of Covered Purchased Nonimpaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Covered purchased nonimpaired loans:
Carrying amount of nonimpaired covered loans, beginning balance	$ 207,167fbp_NonimpairedPurchasedLoansCarryingValue	$ 277,489fbp_NonimpairedPurchasedLoansCarryingValue
Principal repayments	(50,183)fbp_PrincipalRepayments	(63,588)fbp_PrincipalRepayments
Transfers to foreclosed real estate	(5,061)fbp_TransfersToForeclosedRealEstate	(13,977)fbp_TransfersToForeclosedRealEstate
Transfers to non-covered loans due to expiration of loss-share agreement	(38,987)fbp_TransfersToNonCoveredLoans
Loan charge-offs	(3,301)fbp_LoanChargeoffs	(12,957)fbp_LoanChargeoffs
Accretion of loan discount	16,009fbp_AccretionOfLoanDiscount	20,200fbp_AccretionOfLoanDiscount
Balance, ending, carrying value	$ 125,644fbp_NonimpairedPurchasedLoansCarryingValue	$ 207,167fbp_NonimpairedPurchasedLoansCarryingValue

X

- Definition

Theaccrection of the discount on loans.

+ 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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- Details

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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

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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

X

- Definition

The value of loans transferred to non-covered loans due to expiration of the loss-share agreement.

+ References

No definition available.

+ Details

Name:	fbp_TransfersToNonCoveredLoans
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration