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LOAN PORTFOLIO - Credit Risk Payment Activity (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]
Residential mortgage loans insured by FHA or guaranteed by the VA	$ 29,900	$ 29,300
Period of residential mortgage loan that are no longer accruing interest	1 year 3 months	1 year 3 months
Loans considered to be defaulted if borrower has failed to make payment for a period or more than the period	2 months 29 days	2 months 29 days
Loans Receivable Held For Sale Net	$ 32,980	$ 50,006

X

- Definition

Reflects the carrying amount of FHA/VA loans deemed to be questionable as to collection of interest and on which no interest is continuing to be recognized.

+ References

No definition available.

+ Details

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

X

- Definition

Days delinquent before charge-off of credit cards.

+ References

No definition available.

+ Details

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

X

- Definition

Period of residential mortgage loan that are no longer accruing interest.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ 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=82891408&loc=d3e4428-111522

+ Details

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Balance Type:	debit
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