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LOAN PORTFOLIO - Activity for Specific Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Specific Reserve:
Balance at beginning of period	$ 49,514	$ 40,794	$ 51,410	$ 64,421
Provision for loan losses	21,821	13,819	50,277	50,014
Financing Receivable Allowance For Credit Losses Net Write Offs Impaired Loans	(18,022)	(6,458)	(48,374)	(66,280)
Ending balance: specific reserve for impaired loans	$ 53,313	$ 48,155	$ 53,313	$ 48,155

X

- Definition

Amount of direct write-downs, including recoveries, of financing receivables charged against the allowance related to impaired loans.

+ References

No definition available.

+ Details

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

X

- Definition

Provision charged for the period based on estimated losses to be realized from impaired loan transactions.

+ References

No definition available.

+ Details

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

X

- Definition

Schedule of activity for specific reserve.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

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