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Regulatory Restrictions (Narrative) (Details) | Dec. 31, 2018 USD ($)
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Regulatory Restrictions [Abstract] |
Restricted investment in bank | $ 582,000,000
Average reserve balance | $ 3,553,000

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- References No definition available. + Details
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Namespace Prefix: | fbp_
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Period Type: | duration

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- Definition The amount of restricted investment in bank as to transfer to the company without obtaining prior regulatory approval. + References No definition available. + Details
Name: | fbp_RestrictedInvestmentInBank
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 305 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792 + Details
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