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Fair Value (Level 3 assets and liabilities measured at fair value) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Impaired loans	$ 16,437	$ 20,645
Foreclosed real estate	$ 10,103	$ 9,994
General range of significant input values, minimum	0.00%	10.00%
General range of significant input values, maximum	0.00%	10.00%
Impaired Loans [Member]
Valuation technique	Appraised value; PV of expected cash flows
Significant unobservable inputs		Discounts to reflect current market conditions, ultimate collectability, and estimated costs to sell
Foreclosed Real Estate [Member]
Valuation technique	Appraised value; List or contract price
Significant unobservable inputs		Discounts to reflect current market conditions and estimated costs to sell

X

- Definition

Foreclosed real estate.

+ References

No definition available.

+ Details

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- Definition

The maximum general range of significant unobservable input values.

+ References

No definition available.

+ Details

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- Definition

The minimum general range of significant unobservable input values.

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
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X

- Definition

Impaired loans.

+ References

No definition available.

+ Details

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X

- Definition

Description of significant assumptions used by management to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Details

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