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LOANS HELD FOR SALE (Tables) | 9 Months Ended
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Sep. 30, 2021
Receivables Held For Sale [Abstract] |
Loans Held For Sale Table [Text Block] |
|  |  | September 30, 2021 |  | December 31, 2020 |
(In thousands) |  |
Residential mortgage loans | $ | 30,681 |  | $ | 50,289 |

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- Definition Schedule of portfolio of loans held for sale. + References No definition available. + Details
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Namespace Prefix: | fbp_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesHeldForSaleAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration