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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Securities purchased and sold under agreements to repurchase (Detail)	12 Months Ended
	Dec. 31, 2022
NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Modified Repurchase Agreements Threshold	10.00%

X

- Definition

The percentage difference between the cash flows under the terms of the modified repurchase agreement and the present value of the remaining cash flows under the terms of the original instrument.

+ References

No definition available.

+ Details

Name:	fbp_ModifiedRepurchaseAgreementsThreshold
Namespace Prefix:	fbp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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