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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax - unrealized gains (losses) on available for sale securities		$ (685)	$ (184)
Deferred income tax - pension adjustments		(36)	(1,716)
Pre-1988 tax bad debt reserve		$ 6,869	$ 6,869
State income tax rate effective (as a percent)		4.00%	5.00%
Increase decrease in deferred income tax expense		$ 118	$ (3,541)
Scenario, Forecast [Member]
State income tax rate effective (as a percent)	3.00%

X

- Definition

Deferred tax expense (benefit) related to pension adjustments.

+ References

No definition available.

+ Details

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

X

- Definition

Deferred tax expense (benefit) related to unrealized gains and losses on available for sale securities.

+ References

No definition available.

+ Details

Name:	fbp_DeferredIncomeTaxExpenseBenefitUnrealizedGainsLossesOnAvailableForSaleSecurities
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of pre-1988 tax bad debt reserve base years amounts included in retained earnings.

+ References

No definition available.

+ Details

Name:	fbp_Pre1988TaxBadDebtReserve
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage of state income tax rate effective from next fiscal year.

+ References

No definition available.

+ Details

Name:	fbp_StateIncomeTaxRateEffectiveFromNextFiscalYear
Namespace Prefix:	fbp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Details

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