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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Narratives (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Minimum amount of qualifying mortgage collateral with a market value, percent	125.00%
Loans Pledged As Collateral Fair Value	$ 1,400.0	$ 1,400.0
Carrying value of mortgage loans	1,900.0	2,000.0
Additional capacity on credit facility based on collateral pledged at the FHLB	683.6
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Carrying value of mortgage loans	$ 1,700.0	$ 1,700.0

X

- Definition

Fair value as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Minum market value of collateral with respect to FHLB advances outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
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Balance Type:	na
Period Type:	duration

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.

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	credit
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X

- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524

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