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Fair Value (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Fair Value [Abstract] |  |
Increase in fair value of securities available for sale | $ (10,229) | $ 3,288
Tax expense of increase in fair value of securities available for sale | $ 2,390 | $ (1,213)

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The value of unrealized holding gains (losses) net of reclassification adjustments. + References No definition available. + Details
Name: | fbp_UnrealizedHoldingGainsLossesNetOfReclassifications
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Tax expense (benefit) on unrealized holding gains (losses) net of reclassification adjustments. + References No definition available. + Details
Name: | fbp_UnrealizedHoldingGainsLossesNetOfReclassificationsTaxExpenseBenefit
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration