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LOAN PORTFOLIO - Consumer Credit Exposure (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]
Residential mortgage loans insured by FHA or guaranteed by the VA	$ 33,900	$ 33,900	$ 29,900
Period of residential mortgage loan that are no longer accruing interest	1 year 3 months	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 held for sale	$ 65,739	$ 65,739	$ 32,980
Non Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans held for sale	$ 44,200	$ 44,200	$ 8,300

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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X

- Definition

Days delinquent before charge-off of credit cards.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
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- 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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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://fasb.org/us-gaap/role/ref/legacyRef
-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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- Details

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