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FAIR VALUE - Additional Information (Detail)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Maximum amount of interest in brokered CD sold by broker	$ 250,000

X

- Definition

Maximum amount of cash insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	fbp_FdicMaximumInsuredAmount
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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