Fair value of restricted stock granted based on the Corporation's outstanding common stock on the date of the grant.

No definition available.

Name:	fbp_FairValueOfRestrictedStockGranted
Namespace Prefix:	fbp_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Assumption used for the fair value of restricted shares granted under TARP requirements. Holding period by the U.S. Treasury of its outstanding common stock of the Corporation.

+ References

No definition available.

+ Details

Name:	fbp_HoldingPeriodByUsTreasuryOfOutstandingCommonStock
Namespace Prefix:	fbp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Additional restiction for vesting of restricted stock. The stock that has otherwise vested for the passage of time may not become transferable at any time earlier than as permitted under the schedule set forth by TARP, which is based on the repayment in 25% increments of the aggregate financial assistance received from the U.S. Department of Treasury.

+ References

No definition available.

+ Details

Name:	fbp_PercentageIncrementsRepaymentOfAggregateFinancialAssistance
Namespace Prefix:	fbp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

For purpose of comupting the discount, the Corporation estimated a percentage in the value of the common stock and assumed a holding period.

+ References

No definition available.

+ Details

Name:	fbp_PercentageOfAppreciation
Namespace Prefix:	fbp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of common shares outstanding above which option granted cannot exceed.

+ References

No definition available.

+ Details

Name:	fbp_PercentageOfCommonSharesOutstandingAboveWhichOptionGrantedCannotExceed
Namespace Prefix:	fbp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of share vest during period.

+ References

No definition available.

+ Details

Name:	fbp_PercentageOfShareVestDuringPeriod
Namespace Prefix:	fbp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based compensation shares authorized under stock option plans exercise option term.

+ References

No definition available.

+ Details

Name:	fbp_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExerciseOptionTerm
Namespace Prefix:	fbp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

STOCK-BASED COMPENSATION - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended		121 Months Ended	3 Months Ended	9 Months Ended				9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Jan. 21, 2007	Sep. 30, 2013 Board Of Directors [Member]	Sep. 30, 2014 Reversal [Member]	Sep. 30, 2014 Chief Executive Officer [Member]	Sep. 30, 2014 Senior Executives	Sep. 30, 2014 Omnibus Plan [Member]	Sep. 30, 2014 Omnibus Plan [Member] Board Of Directors [Member]	Sep. 30, 2014 Omnibus Plan [Member] Senior Executives	Sep. 30, 2014 Troubled Asset Relief Program [Member]	Sep. 30, 2014 Troubled Asset Relief Program [Member] Chief Executive Officer [Member]	Sep. 30, 2014 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2014 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member] Board Of Directors [Member]	Sep. 30, 2014 Restricted Stock [Member] Maximum [Member] Board Of Directors [Member]	Sep. 30, 2014 Restricted Stock [Member] Minimum [Member] Board Of Directors [Member]	Sep. 30, 2014 Restricted Stock [Member] Senior Executives	Sep. 30, 2013 Restricted Stock [Member] Omnibus Plan [Member] Chief Executive Officer [Member]	Sep. 30, 2014 Restricted Stock [Member] Troubled Asset Relief Program [Member]	Sep. 30, 2013 Restricted Stock [Member] Troubled Asset Relief Program [Member] Chief Executive Officer [Member]	Sep. 30, 2014 First Fifty Percentage Restricted Stock Nonvest Awards [Member]	Sep. 30, 2013 First Fifty Percentage Restricted Stock Nonvest Awards [Member]	Sep. 30, 2014 First Fifty Percentage Restricted Stock Nonvest Awards [Member] Omnibus Plan [Member]	Sep. 30, 2014 Other Fifty Percentage Restricted Stock Nonvest Awards [Member]	Sep. 30, 2013 Other Fifty Percentage Restricted Stock Nonvest Awards [Member]	Sep. 30, 2014 Other Fifty Percentage Restricted Stock Nonvest Awards [Member] Omnibus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Authorized granting up shares				579,740					8,169,807
Percentage of common shares outstanding above which option granted cannot exceed				20.00%
Maximum term to exercise options	10 years 0 months 0 days
Granted shares											224,162
Percentage of Share vest during period																										50.00%	50.00%		50.00%	50.00%
Percentage increments repayment under TARP												25.00%
Share based compensation cost						$ 65,000		$ 1,200,000						$ 600,000	$ 500,000	$ 1,800,000	$ 1,100,000
Granted shares of restricted stock		1,219,711			22,218		840,138			379,573			653,138									716,405		582,905
Restricted stock vesting period																		1 year 0 months 0 days	5 years 0 months 0 days	1 year 0 months 0 days					2 years 0 months 0 days	2 years 0 months 0 days		3 years 0 months 0 days	3 years 0 months 0 days
Restricted stock granted to Board of Directors		(119,838)
Stock based compensation expense unrecognized related to nonvested shares of restricted stock	$ 4,700,000	$ 4,700,000
Period for cost recognition not yet recognized	2 years 2 months 12 days
Fair Value Of Restricted Stock Granted																							$ 2.63	$ 3.02
Weighted-Average Grant Date Fair Value of Stocks		$ 3.75									$ 5.21
Holding Period By The Us Treasury Of Outstanding Common Stock		2 years 0 months 0 days	2 years 0 months 0 days
Percentage of appreciation																							16.00%	13.00%
Repurchased of common stock											74,989					23,555					98,544