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DEPOSITS - Components of Interest Expense on Deposits (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Deposits [Abstract]
Interest expense on deposits	$ 16,709	$ 16,453	$ 49,983	$ 47,804
Accretion Of Premium From Acquisitions	(2)	(9)	(7)	(47)
Amortization of broker placement fees	272	454	948	1,461
Interest expense on deposits	$ 16,979	$ 16,898	$ 50,924	$ 49,218

X

- Definition

This item represents the accretion of premium from core deposit intangible acquired.

+ References

No definition available.

+ Details

Name:	fbp_AccretionOfPremiumFromAcquisitions
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amortization of broker placement fees

+ References

No definition available.

+ Details

Name:	fbp_AmortizationOfBrokerPlacementFees
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Total interest expense of deposits excluding broker placement fees and unralized gains (losses) on derivatives

+ References

No definition available.

+ Details

Name:	fbp_InterestExpenseDepositsNoBrokerPlacementFees
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Aggregate amount of interest expense on all deposits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.6)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

+ Details

Name:	us-gaap_InterestExpenseDeposits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration