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Fair Value (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value [Abstract]
Increase in fair value of securities available for sale	$ 5,903	$ (7,290)
Tax expense of increase in fair value of securities available for sale	$ (1,380)	$ 1,703

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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
Period Type:	duration

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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
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration