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DEPOSITS - Narratives (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Deposits [Line Items]
Time deposits in denominations of $250,000 or more	$ 1,800.0	$ 1,500.0
Unamortized broker placement fees	$ 1.0	$ 1.1

X

- Definition

Deposits [Line Items]

+ References

No definition available.

+ Details

Name:	fbp_DepositsLineItems
Namespace Prefix:	fbp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

unamortized amount of costs for brokerage fees paid for issuance of brokered CDs.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

+ Details

Name:	us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant