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OTHER REAL ESTATE OWNED- Additional information (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Other Real Estate And Foreclosed Assets [Abstract]
Transfers From Loans To Other Receivable	$ 21,300,000	$ 15,000,000

X

- Definition

Amount of foreclosures completed that meet the conditions of ASC 310-40 and are presented as a receivable (other assets) in the statement of financial condition.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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