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DEPOSITS - Components of Interest Expense on Deposits (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Deposits [Abstract] |  |  |  |
Interest expense on deposits | $ 18,921 | $ 16,667 | $ 36,226 | $ 33,274
Accretion Of Premium From Acquisitions | (2) | (2) | (4) | (5)
Amortization of broker placement fees | 184 | 309 | 373 | 676
Interest expense on deposits | $ 19,103 | $ 16,974 | $ 36,595 | $ 33,945

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