XML 107 R88.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
401(k) Plan [Member] |  |  |  |
Deferral rate |  | 5.00% |  |
Percent of annual salary employees may contribute |  | 15.00% |  |
Percent matched by company up to 3 percent of employee salary |  | 100.00% |  |
Percent matched by company 3-5 percent of employee salary |  | 50.00% |  |
Matching contributions |  | $ 2,300 | $ 1,600 | $ 1,400
401(k) Plan [Member] | Subsequent Event [Member] |  |  |  |
Percent matched by company up to 6 percent of employee salary | 100.00% |  |  |
Pension Plan [Member] |  |  |  |
Accumulated benefit obligation |  | $ 38,150 | $ 36,840 | 36,164
Expected average annual rate of return, minimum |  | 7.00% | 7.00% |
Expected average annual rate of return, maximum |  | 10.00% | 10.00% |
Pension Plan [Member] | Fixed Income [Member] |  |  |  |
Pension plans allocated assets (percentage) |  | 25.00% | 25.00% |
Pension Plan [Member] | Equity Securities1 [Member] |  |  |  |
Pension plans allocated assets (percentage) |  | 75.00% | 75.00% |
SERP [Member] |  |  |  |
Accumulated benefit obligation |  | $ 5,970 | $ 5,910 | $ 5,778

X
- Definition The automatic rate of deferral for employees enrolled in a defined contribution plan. + References No definition available. + Details
Name: | fbp_DeferralRate
Namespace Prefix: | fbp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum expected average annual rate of return on investments. + References No definition available. + Details
Name: | fbp_ExpectedAverageAnnualRateOfReturnMaximum
Namespace Prefix: | fbp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum expected average annual rate of return on investments. + References No definition available. + Details
Name: | fbp_ExpectedAverageAnnualRateOfReturnMinimum
Namespace Prefix: | fbp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percent matched by company in the range of 3 to 5 percent of employee salary. + References No definition available. + Details
Name: | fbp_PercentMatchedByCompany305PercentOfEmployeeSalary
Namespace Prefix: | fbp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percent matched by company up to 6 percent of employee salary. + References No definition available. + Details
Name: | fbp_PercentMatchedByCompany6PercentOfEmployeeSalary
Namespace Prefix: | fbp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percent matched by company up to 3 percent of employee salary for the defined contribution plan. + References No definition available. + Details
Name: | fbp_PercentMatchedByCompanyUpTo3PercentOfEmployeeSalary
Namespace Prefix: | fbp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + 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) -URI http://asc.fasb.org/extlink&oid=82843861&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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=fbp_Plan401kMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=fbp_PensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=fbp_EquitySecurities1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=fbp_SerpPlanCurrentYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |