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Fair Value (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Fair Value [Abstract]
Increase in fair value of securities available for sale	$ 3,128	$ (153)
Tax expense of increase in fair value of securities available for sale	$ (1,222)	$ 60

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- References

No definition available.

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- Definition

The value of unrealized holding gains (losses) net of reclassification adjustments.

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No definition available.

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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.

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No definition available.

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Name:	fbp_UnrealizedHoldingGainsLossesNetOfReclassificationsTaxExpenseBenefit
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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