XML 111 R100.htm IDEA: XBRL DOCUMENT
v3.10.0.1

LOAN PORTFOLIO - Narratives (Detail) | 3 Months Ended
--- | ---
Sep. 30, 2018
Disclosure Loan Portfolio Additional Information [Abstract] |
Branches Doral | 10

X
- Definition Number of Branches acquired in Doral Bank Acquisition. + References No definition available. + Details
Name: | fbp_BranchesDoral
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure - LOAN PORTFOLIO - Additional Information [Abstract] + References No definition available. + Details
Name: | fbp_DisclosureLoanPortfolioAdditionalInformationAbstract
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration