Loans and Asset Quality Information (Schedule of Analysis of Payment Status of Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Analysis of the payment status of loans
Nonaccrual loans	$ 27,468	$ 47,810
Total loans	2,710,712	2,416,285
Unamortized net deferred loan fees	(49)	873
Total loans	2,710,712	2,518,926
Covered Loans		102,641
30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due		25,099
60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due		5,394
Commercial, financial, and agricultural [Member]
Analysis of the payment status of loans
Nonaccrual loans	1,842	2,964
Real estate - construction, land development & other land loans
Analysis of the payment status of loans
Nonaccrual loans	2,945	4,704
Real estate residential, farmland and mutli-family [Member]
Analysis of the payment status of loans
Nonaccrual loans	16,017	23,829
Real estate home equity lines of credit [Member]
Analysis of the payment status of loans
Nonaccrual loans	2,355	3,525
Real estate - mortgage - commercial and other [Member]
Analysis of the payment status of loans
Nonaccrual loans	4,208	12,571
Non-covered loans to Individual
Analysis of the payment status of loans
Nonaccrual loans	101	217
All Total Loans [Member]
Analysis of the payment status of loans
Nonaccrual loans	27,468	47,810
Current	2,673,391	2,439,750
Total loans	2,710,761	2,518,053
All Total Loans [Member] \| 30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	8,471	25,099
All Total Loans [Member] \| 60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	1,431	5,394
All Total Loans [Member] \| Commercial, financial, and agricultural [Member]
Analysis of the payment status of loans
Nonaccrual loans	1,842	2,964
Current	259,879	198,581
Total loans	261,813	202,671
All Total Loans [Member] \| Commercial, financial, and agricultural [Member] \| 30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	92	999
All Total Loans [Member] \| Commercial, financial, and agricultural [Member] \| 60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due		127
All Total Loans [Member] \| Real estate - construction, land development & other land loans
Analysis of the payment status of loans
Nonaccrual loans	2,945	4,704
Current	351,081	302,324
Total loans	354,667	308,969
All Total Loans [Member] \| Real estate - construction, land development & other land loans \| 30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	473	1,512
All Total Loans [Member] \| Real estate - construction, land development & other land loans \| 60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	168	429
All Total Loans [Member] \| Real estate residential, farmland and mutli-family [Member]
Analysis of the payment status of loans
Nonaccrual loans	16,017	23,829
Current	729,732	725,673
Total loans	750,679	768,559
All Total Loans [Member] \| Real estate residential, farmland and mutli-family [Member] \| 30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	4,487	15,443
All Total Loans [Member] \| Real estate residential, farmland and mutli-family [Member] \| 60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	443	3,614
All Total Loans [Member] \| Real estate home equity lines of credit [Member]
Analysis of the payment status of loans
Nonaccrual loans	2,355	3,525
Current	234,821	227,695
Total loans	239,105	232,601
All Total Loans [Member] \| Real estate home equity lines of credit [Member] \| 30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	1,751	1,276
All Total Loans [Member] \| Real estate home equity lines of credit [Member] \| 60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	178	105
All Total Loans [Member] \| Real estate - mortgage - commercial and other [Member]
Analysis of the payment status of loans
Nonaccrual loans	4,208	12,571
Current	1,043,321	938,561
Total loans	1,049,460	957,587
All Total Loans [Member] \| Real estate - mortgage - commercial and other [Member] \| 30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	1,482	5,591
All Total Loans [Member] \| Real estate - mortgage - commercial and other [Member] \| 60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	449	864
All Total Loans [Member] \| Non-covered loans to Individual
Analysis of the payment status of loans
Nonaccrual loans	101	217
Current	51,557	46,916
Total loans	55,037	47,666
All Total Loans [Member] \| Non-covered loans to Individual \| 30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	186	278
All Total Loans [Member] \| Non-covered loans to Individual \| 60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	193	255
Covered [Member]
Analysis of the payment status of loans
Nonaccrual loans		7,816
Current		91,110
Total loans		102,641
Unamortized net deferred loan fees
Covered Loans		102,641
Covered [Member] \| 30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due		3,313
Covered [Member] \| 60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due		$ 402

No definition available.

Name:	fbp_AnalysisOfPaymentStatusOfLoansAbstract
Namespace Prefix:	fbp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate gross carrying amount of loans receivable.

+ References

No definition available.

+ Details

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

- Definition

Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

+ Details

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

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

+ Details

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

- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

+ Details

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

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

+ Details

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

- Definition

Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements.

+ References

No definition available.

+ Details

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

- Definition

Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533

+ Details

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

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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