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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
One-time charge associated with FDIC implementation of special assessment	$ 7.4
Payment for one-time charge associated with FDIC implementation of special assessment	3.9
Commitments to extend credit amount	2,200.0
Standby Letters Of Credit [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Commitments to extend credit amount	61.4
Credit Card [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Commitments to extend credit amount	$ 800.0
Basel III [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital Conservation Buffer	2.50%

X

- Definition

In order to avoid limitations on capital distributions and certain discretionary bonus payments, banking organizations will be requiered to hold a specific amount of excess of their minimum risk-based capital ratios.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

One-Time Charge Associated With FDIC Implementation Of Special Assessment

+ References

No definition available.

+ Details

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

X

- Definition

Payment for one-time charge associated with FDIC implementation of special assessment

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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- Definition

Unused amount of commitments to extend credit to customers.

+ References

No definition available.

+ Details

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X

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X

- Details

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Namespace Prefix:
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X

- Details

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