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Employee Benefit Plans (Schedule of Targeted Mix of Pension Plan's Assets) (Details)	12 Months Ended
	Dec. 31, 2015
Fixed income investments - Cash/money market account [Member]
Targeted percentage of plan assets	2.00%
Targeted percentage of plan assets, minimum	1.00%
Targeted percentage of plan assets, maximum	5.00%
Fixed income investments - US government bond fund [Member]
Targeted percentage of plan assets	10.00%
Targeted percentage of plan assets, minimum	10.00%
Targeted percentage of plan assets, maximum	20.00%
Fixed income investments - US corporate bond fund [Member]
Targeted percentage of plan assets	10.00%
Targeted percentage of plan assets, minimum	5.00%
Targeted percentage of plan assets, maximum	15.00%
Fixed income investments - US corporate high yield bond fund [Member]
Targeted percentage of plan assets	5.00%
Targeted percentage of plan assets, minimum	0.00%
Targeted percentage of plan assets, maximum	10.00%
Equity investments - Large cap value fund [Member]
Targeted percentage of plan assets	40.00%
Targeted percentage of plan assets, minimum	30.00%
Targeted percentage of plan assets, maximum	50.00%
Equity investments - Mid cap equity fund [Member]
Targeted percentage of plan assets	10.00%
Targeted percentage of plan assets, minimum	5.00%
Targeted percentage of plan assets, maximum	15.00%
Equity investments - Small cap growth fund [Member]
Targeted percentage of plan assets	8.00%
Targeted percentage of plan assets, minimum	5.00%
Targeted percentage of plan assets, maximum	15.00%
Equity investments - Foreign equity fund [Member]
Targeted percentage of plan assets	10.00%
Targeted percentage of plan assets, minimum	5.00%
Targeted percentage of plan assets, maximum	15.00%
Equity investments - Company stock [Member]
Targeted percentage of plan assets	5.00%
Targeted percentage of plan assets, minimum	0.00%
Targeted percentage of plan assets, maximum	10.00%

X

- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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Balance Type:	na
Period Type:	duration

X

- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

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X

- Details

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X

- Details

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X

- Details

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X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=fbp_MidCapEquityFundMember
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X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=fbp_SmallCapGrowthFundMember
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X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=fbp_ForeignEquityFundMember
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X

- Details

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