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LOAN PORTFOLIO - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended | 21 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) numberofcontracts | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2011 USD ($) | Dec. 30, 2017 USD ($) | Dec. 31, 2014 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Income on Impaired Loans Accrual Basis |  |  |  |  |  |  | $ 24,243 | $ 24,095 |  |  |  |
Contractually outstanding principal and interest at acquisition |  |  |  |  | $ 207,300 |  | 196,600 | 207,300 |  |  |  |
Loans |  |  |  |  | 8,886,873 |  | 8,850,476 | 8,886,873 |  |  |  |
Total TDR loans |  |  |  |  | 647,048 |  | 587,219 | 647,048 | $ 661,591 |  |  | $ 694,453
Financing Receivable, Modifications, Recorded Investment |  |  |  |  | 647,048 |  | 587,219 | 647,048 | 661,591 |  |  | $ 694,453
Provsion of PCI Loans |  |  |  |  |  |  | 4,394 | 2,895 |  |  |  |
Classified And Non Performing Loans Sold |  |  |  |  | 16,300 | $ 147,500 |  |  |  |  |  |
Other Real Estate Owned Sold |  |  |  |  |  | 2,900 |  |  |  |  |  |
Sales Price Of Bulk Sale |  |  |  |  |  | 87,300 |  |  |  |  |  |
Reserves Allocated To Bulk Sale |  |  |  |  | 2,800 | 15,300 |  | 2,800 |  |  |  |
Bulk Sale Charge Offs |  |  |  |  | 4,600 | 61,400 |  |  |  |  |  |
Professional Fees Bulk Sale |  |  |  |  |  | 900 |  |  |  |  |  |
PreTax Loss Bulk Sale |  |  |  |  | 1,800 | 48,700 |  |  |  |  |  |
Recoveries |  |  |  |  |  |  | 16,756 | 15,088 |  |  |  |
Line Of Credit Facility Provided To Fund Unfunded Commitments |  |  |  |  |  |  |  |  |  | $ 80,000 |  |
Loans Receivable Held For Sale Net |  |  |  |  | 50,006 |  | 32,980 | 50,006 |  |  |  |
Proceeds From Sale Of Loans Held For Investment |  |  |  |  |  |  | $ 53,245 | 31,852 | 107,702 |  |  |
Trouble Debt Restructurings Trial Period |  |  |  |  |  |  | 5 months 27 days |  |  |  |  |
Threshold Mortgage Loans Principal Amount Puerto Rico Housing Financing Authority |  |  |  |  |  | 75,000 |  |  |  |  |  |
Puerto Rico Housing Finance Authority Covered Loans |  |  |  |  |  | 552,000 |  |  |  |  |  |
Puerto Rico Housing Finance Authority Restricted Net Position |  |  |  |  |  | 77,400 |  |  |  |  |  |
Residential mortgage loans in process of foreclosure |  |  |  |  |  |  | $ 162,200 |  |  |  |  |
Mortgage Loans Foreclosure Delinquency Threshold |  |  |  |  |  |  | 4 months |  |  |  |  |
Classified And Non Performing Loans Sold Outstanding Balance |  |  |  |  | 20,100 |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses Write Offs Impaired Loans | [1] |  |  |  |  |  | $ 82,113 | 67,210 | 99,023 |  |  |
Proceeds From Sale Of Non Performing Assets Sold |  |  |  |  | 11,300 |  |  |  |  |  |  |
Proceeds From Principal Repayments On Loans And Leases Held For Investment |  |  |  |  |  |  | 2,504,629 | 2,830,830 | 2,969,616 |  |  |
Hurricane [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provsion of PCI Loans |  |  |  |  |  |  | $ 1,800 |  |  |  |  |
Hurricane [Member] | Payment Deferral [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payment Deferral Period |  |  |  |  |  |  | 2 months 29 days |  |  |  |  |
Residential Mortgage Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Significant Purchases |  |  |  |  |  |  | $ 58,900 |  |  |  |  |
Securitization of mortgage loans into mortgage backed securities |  |  |  |  |  |  | 235,100 |  |  |  |  |
Loans |  |  |  |  | 3,296,031 |  | 3,290,957 | 3,296,031 |  |  |  |
Recoveries |  |  |  |  |  |  | 2,437 | 2,941 |  |  |  |
Residential Mortgage Loans [Member] | Hurricane [Member] | Payment Deferral [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | $ 1,300,000 |  |  |  |  |
Financing Receivable Deferral Payment Number Of Agreements | numberofcontracts |  |  |  |  |  |  | 9,588 |  |  |  |  |
Residential Mortgage Loans [Member] | Hurricane [Member] | Financing Receivables 30 To 89 Days Past Due [Member] | Payment Deferral [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | $ 95,100 |  |  |  |  |
Government Guaranteed Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total TDR loans |  |  |  |  | 69,100 |  | 62,100 | 69,100 |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  | 69,100 |  | 62,100 | 69,100 |  |  |  |
Residential mortgage loans in process of foreclosure |  |  |  |  |  |  | 23,600 |  |  |  |  |
Loans in trial [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total TDR loans |  |  |  |  |  |  | 800 |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  |  |  | 800 |  |  |  |  |
Troubled Debt Restructurings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding unfunded commitments on TDR loans |  |  |  |  |  |  | 9,400 |  |  |  |  |
Allowance For Loan And Lease Losses Write Offs Loans Sold |  |  |  |  |  |  | 10,700 | 1,300 | 45,300 |  |  |
Loans Split [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total TDR loans |  |  |  |  | 36,971 |  | 35,577 | 36,971 | 39,329 |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  | 36,971 |  | 35,577 | 36,971 | 39,329 |  |  |
Financing Receivable Loans Restructured Recorded Investment Accruals |  |  |  |  |  |  | 3,100 |  |  |  |  |
Non-FHA/VA Residential Mortgage loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total TDR loans |  |  |  |  | 375,809 |  | 363,930 | 375,809 | 382,672 |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  | 375,809 |  | 363,930 | 375,809 | 382,672 |  |  |
Commercial And Industrial Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Income on Impaired Loans Accrual Basis |  |  |  |  |  |  | 1,447 | 631 |  |  |  |
Total TDR loans |  |  |  |  | 133,521 |  | 94,112 | 133,521 | 150,254 |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  | 133,521 |  | 94,112 | 133,521 | 150,254 |  |  |
Classified And Non Performing Loans Sold |  |  |  |  |  | 45,800 |  |  |  |  |  |
Payments To Acquire Loans Held For Investment |  |  |  |  |  |  | 52,600 |  |  |  |  |
Commercial Mortgage Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Income on Impaired Loans Accrual Basis |  |  |  |  |  |  | 1,983 | 1,403 |  |  |  |
Loans |  |  |  |  | 1,568,808 |  | 1,614,972 | 1,568,808 |  |  |  |
Total TDR loans |  |  |  |  | 48,742 |  | 50,812 | 48,742 | 44,498 |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  | 48,742 |  | 50,812 | 48,742 | 44,498 |  |  |
Classified And Non Performing Loans Sold |  |  |  |  |  | 90,700 |  |  |  |  |  |
Recoveries |  |  |  |  |  |  | 270 | 816 |  |  |  |
Proceeds From Sale Of Loans Held For Investment |  |  |  |  |  |  |  | 20,200 | 20,000 |  |  |
Construction Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  | 124,951 |  | 111,397 | 124,951 |  |  |  |
Total TDR loans |  |  |  |  |  |  | 41,800 |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  |  |  | 41,800 |  |  |  |  |
Classified And Non Performing Loans Sold |  |  |  |  |  | $ 11,000 |  |  |  |  |  |
Recoveries |  |  |  |  |  |  | 732 | 316 |  |  |  |
Consumer Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  | 1,716,628 |  | 1,749,897 | 1,716,628 |  |  |  |
Total TDR loans |  |  |  |  |  |  | 36,600 |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  |  |  | 36,600 |  |  |  |  |
Recoveries |  |  |  |  |  |  | 7,562 | 8,326 |  |  |  |
Impaired Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance For Loan And Lease Losses Write Offs Loans Sold |  |  |  |  |  |  | 10,700 | 4,200 | 63,900 |  |  |
Commercial Portfolio Segment [Member] | Hurricane [Member] | Payment Deferral [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |
Financing Receivable Deferral Payment Number Of Agreements | numberofcontracts |  |  |  |  |  |  | 351 |  |  |  |  |
Commercial Portfolio Segment [Member] | Hurricane [Member] | Financing Receivables 30 To 89 Days Past Due [Member] | Payment Deferral [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | $ 3,200 |  |  |  |  |
Fnma And Fhlmc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans Repurchased |  |  |  |  |  |  | 36 | 700 | 1,400 |  |  |
Fnma And Fhlmc [Member] | Residential Mortgage Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Significant Sales |  |  |  |  |  |  | 87,500 |  |  |  |  |
Puerto Rico Tourism Development Fund [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding of credit facilities granted |  |  |  |  | 127,700 |  | 120,200 | 127,700 |  |  |  |
Financing Receivable Commercial Governments Book Value |  |  |  |  | 111,800 |  | $ 70,800 | 111,800 |  |  |  |
Unpaid Principal Balance Percentage |  |  |  |  |  |  | 52.00% |  |  |  |  |
Proceeds From Interest Received |  |  |  |  |  |  |  |  |  |  | $ 4,700 |
Financing Receivable Allowance For Credit Losses Write Offs Impaired Loans |  |  |  |  |  |  | $ 30,800 |  |  |  |  |
Proceeds From Principal Repayments On Loans And Leases Held For Investment |  | $ 4,000 | $ 7,600 |  |  |  |  |  |  |  |  |
Puerto Rico Electric Power Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Classified And Non Performing Loans Sold |  |  |  | $ 64,000 |  |  |  |  |  |  |  |
Reserves Allocated To Bulk Sale |  |  |  | 10,200 |  |  |  |  |  |  |  |
PreTax Loss Bulk Sale |  |  |  | 600 |  |  |  |  |  |  |  |
Classified And Non Performing Loans Sold Outstanding Balance |  |  |  | 75,000 |  |  |  |  |  |  |  |
Proceeds From Sale Of Non Performing Assets Sold |  |  |  | $ 53,200 |  |  |  |  |  |  |  |
Puerto Rico Housing Finance Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Government Guaranteed Residential Mortgage Loans |  |  |  |  |  |  | 116,500 |  |  |  |  |
GNMA certificates [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans Repurchased |  |  |  |  |  |  | $ 25,100 | 29,100 | $ 19,200 |  |  |
Puerto Rico [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit risk concentration |  |  |  |  |  |  | 75.00% |  |  |  |  |
Outstanding of credit facilities granted |  |  |  |  | 133,600 |  | $ 55,900 | 133,600 |  |  |  |
Puerto Rico [Member] | Puerto Rico Government And Political Subdivisions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding of credit facilities granted |  |  |  |  |  |  | 33,900 |  |  |  |  |
Puerto Rico [Member] | Public Corporations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding of credit facilities granted |  |  |  |  |  |  | 15,100 |  |  |  |  |
Puerto Rico [Member] | Government [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding of credit facilities granted |  |  |  |  |  |  | $ 6,800 |  |  |  |  |
Virgin Islands [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit risk concentration |  |  |  |  |  |  | 6.00% |  |  |  |  |
Outstanding of credit facilities granted |  |  |  |  | $ 84,700 |  | $ 70,400 | $ 84,700 |  |  |  |
Virgin Islands [Member] | Public Corporations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding of credit facilities granted |  |  |  |  |  |  | 47,200 |  |  |  |  |
Virgin Islands [Member] | Government [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding of credit facilities granted |  |  |  |  |  |  | $ 23,200 |  |  |  |  |
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit risk concentration |  |  |  |  |  |  | 19.00% |  |  |  |  |
Credit Impaired Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage loans in process of foreclosure |  |  |  |  |  |  | $ 20,500 |  |  |  |  |
[1] | For the year ended December 31, 2017, includes a charge-off of $10.7 million related to the sale of the PREPA credit line, as further discussed below. For the year ended December 31, 2016, includes $4.2 million of charge-offs related to impaired loans included in a sale of a $16.3 million pool of non-performing assets and, for the year ended December 31, 2015, includes $63.9 million of charge-offs related to a bulk sales of assets, as further discussed below.

X
- Definition Amount of loans that have been written-off. This item is specifically associated with the bulk sale of assets completed during the reporting period. + References No definition available. + Details
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Namespace Prefix: | fbp_
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Balance Type: | debit
Period Type: | duration

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- Definition Additional charge-offs associated to loans sold. + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Classified and non-performing loans sold during the period. + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Outstanding balance of classified and non-performing loans sold during the period. + References No definition available. + Details
Name: | fbp_ClassifiedAndNonPerformingLoansSoldOutstandingBalance
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of direct write-downs of financing receivables charged against the allowance related to impaired loans. + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount represents the book value of loans and leases issued to a unit or agency of a federal, state or local jurisdiction within the country of domicile of the reporting entity. + References No definition available. + Details
Name: | fbp_FinancingReceivableCommercialGovernmentsBookValue
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of financing receivbales with three month deferred payment arregements. + References No definition available. + Details
Name: | fbp_FinancingReceivableDeferralPaymentNumberOfAgreements
Namespace Prefix: | fbp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing receivable loans restructured recorded investment accruals. + References No definition available. + Details
Name: | fbp_FinancingReceivableLoansRestructuredRecordedInvestmentAccruals
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of residential mortgage that are guaranteed by a unit or agency of a federal, state or local jurisdiction. + References No definition available. + Details
Name: | fbp_GovernmentGuaranteedResidentialMortgageLoans
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line of credit facility provided to fund unfunded commitments. + References No definition available. + Details
Name: | fbp_LineOfCreditFacilityProvidedToFundUnfundedCommitments
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Loans repurchased persuant to the repurchase option. + References No definition available. + Details
Name: | fbp_LoansRepurchased
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References No definition available. + Details
Name: | fbp_MortgageLoansForeclosureDelinquencyThreshold
Namespace Prefix: | fbp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Other real estate property sold during the period. + References No definition available. + Details
Name: | fbp_OtherRealEstateOwnedSold
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The time during which a borrower does not have to pay interest or repay the principal on a loan. + References No definition available. + Details
Name: | fbp_PaymentDeferralPeriod
Namespace Prefix: | fbp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pre tax loss related to the bulk sale of loans. + References No definition available. + Details
Name: | fbp_PreTaxLossBulkSale
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of non performing assets. + References No definition available. + Details
Name: | fbp_ProceedsFromSaleOfNonPerformingAssetsSold
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Professional fees associated to the bulk sale of loans and other real estate owned. + References No definition available. + Details
Name: | fbp_ProfessionalFeesBulkSale
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Aggregated amount of loans covered by the Puerto Rico Housing Finance Authority under the mortgage loans insurance program. + References No definition available. + Details
Name: | fbp_PuertoRicoHousingFinanceAuthorityCoveredLoans
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
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- Definition Amount represents the restricted net position of the Puerto Rico Housing Finance Authority under the mortgage loans insurance program. + References No definition available. + Details
Name: | fbp_PuertoRicoHousingFinanceAuthorityRestrictedNetPosition
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
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