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LOAN PORTFOLIO - Activity for Specific Reserve (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Specific Reserve: |  |  |  |
Related Allowance Beginning Balance | $ 64,421 | $ 52,581 | $ 55,205 |
Provision for loan losses | 68,375 | 78,695 |  | $ 91,515
Net Charge-offs | (81,386) | (66,855) | (94,139) |
Related Allowance Ending Balance | $ 51,410 | $ 64,421 | $ 52,581 |

X
- Definition Amount after recoveries, of direct write-downs 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

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- 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: | credit
Period Type: | instant

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- 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

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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