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Accounting Policies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |
Reclassified amount between Accumulated Other Comprehensive Income and Retained Earnings | $ 700

X
- Definition Reclassified amount between accumulated other comprehensive income and retained earnings. + References No definition available. + Details
Name: | fbp_ReclassifiedAmountBetweenAccumulatedOtherComprehensiveIncomeAndRetainedEarnings
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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