Loans and Asset Quality Information (Summary of Major Categories of Non-Covered Loans Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Non-covered loans:
Total loans	$ 2,274,787	$ 2,267,634	$ 2,255,967
Percentage of Loans	100.00%fbp_PercentageOfLoansNonCovered	100.00%fbp_PercentageOfLoansNonCovered	100.00%fbp_PercentageOfLoansNonCovered
Unamortized net deferred loan costs	783	946	759
Loans - non-covered	2,275,570	2,268,580	2,256,726
Commercial, financial and agricultural [Member]
Non-covered loans:
Total loans	174,516	159,195	176,597
Percentage of Loans	8.00%	7.00%	8.00%
Real Estate construction, land development and other land loans [Member]
Non-covered loans:
Total loans	279,780	282,604	269,216
Percentage of Loans	12.00%	13.00%	12.00%
Real estate mortgage residential (1-4 family) first mortgages [Member]
Non-covered loans:
Total loans	690,910	700,101	729,080
Percentage of Loans	31.00%	31.00%	32.00%
Real estate mortgage home equity loans/lines of credit [Member]
Non-covered loans:
Total loans	211,337	210,697	215,128
Percentage of Loans	9.00%	9.00%	10.00%
Real estate mortgage commercial and other [Member]
Non-covered loans:
Total loans	870,234	864,333	811,612
Percentage of Loans	38.00%	38.00%	36.00%
Installment loans to individual [Member]
Non-covered loans:
Total loans	$ 48,010	$ 50,704	$ 54,334
Percentage of Loans	2.00%	2.00%	2.00%

Aggregate gross carrying amount of loans before unamortized net deferred loan costs. Excludes loans and leases covered under loss sharing agreements.

No definition available.

+ Details

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

- Details

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

- Definition

Percentage of non-covered loans.

+ References

No definition available.

+ Details

Name:	fbp_PercentageOfLoansNonCovered
Namespace Prefix:	fbp_
Data Type:	num:percentItemType
Balance Type:	na
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=28367877&loc=d3e4428-111522

+ Details

Name:	us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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