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LOAN PORTFOLIO -Changes in Carrying Amount Of Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |
Beggining balance: purchased credit-impaired loans | $ 152,242 | $ 160,368 | $ 158,174 | $ 165,818 |  |  |  |
Accretion | 2,524 | 2,656 | 7,717 | 8,177 |  |  |  |
Collections | (4,835) | (4,225) | (12,590) | (13,327) |  |  |  |
Purchased Credit Impaired Loans Foreclosures | (809) | (1,005) | (4,179) | (2,874) |  |  |  |
Ending balance: purchased credit-impaired loans | 149,122 | 157,794 | 149,122 | 157,794 |  |  |  |
Allowance for loan losses Purchased Credit Impaired | (11,354) | (10,235) | (11,354) | (10,235) | $ (11,354) | $ (11,251) | $ (9,446) | $ (6,857)
Ending balance: purchased credit-impaired loans, net | $ 137,768 | $ 147,559 | $ 137,768 | $ 147,559 |  |  |  |

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- Definition The recorded balance for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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Period Type: | instant

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- Definition Amount of real estate investments acquired through foreclosure during the period related to purchased credit impaired loans. + References No definition available. + Details
Name: | fbp_PurchasedCreditImpairedLoansForeclosures
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents the collection for the loans acquired from Doral under ASC 310-30. The amount reflects the amount of collections received from related parties to reduce the carrying amounts of loans receivable due from them, net of charge-offs, which sets forth the basis for charging to bad debt expense all or a portion of loan receivables because it is probable, based on collection experience or on specific facts and circumstances, that collection of amounts due will not be made. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- 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. + Details
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