Accretion of loan discount on covered purchased nonimpaired loans.

No definition available.

Name:	fbp_AccretionOfLoanDiscount
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Additional loan interest income.

+ References

No definition available.

+ Details

Name:	fbp_AdditionalLoanInterestIncome
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Nonaccrual loans that are currently in the process of foreclosure.

+ References

No definition available.

+ Details

Name:	fbp_NonaccrualLoansInProcessOfForeclosure
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Refers to payments that exceeded initial carrying values of purchased impaired laons.

+ References

No definition available.

+ Details

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

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

+ Details

Name:	us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_FixedRateResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=fbp_PurchasedImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=fbp_CarolinaBankHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=fbp_FinancingReceivables90OrMoreDaysPastDueMember
Namespace Prefix:
Data Type:	na
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Period Type:

Loans and Asset Quality Information (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Mar. 03, 2017
Accretion of loan discount				$ 1,908
Recoveries	$ 2,345	$ 1,513	$ 3,592	3,424	$ 6,685
Recorded loans with a fair value						$ 497,500
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
Nonaccrual loans in process of foreclosure	1,100		1,100		$ 1,700
Purchased Impaired Loans [Member]
Accretion of loan discount			558	780
Payments that exceeded the initial carrying amount on purchased impaired loans			564	1,108
Recoveries				33
Additional loan interest income			6	$ 295
Recorded loans with a fair value						$ 19,300
Purchased Impaired Loans [Member] \| Carolina Bank Holdings, Inc. [Member] \| 90 Days or More Past Due [Member]
Recorded loans with a fair value	$ 400		$ 400