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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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% | 100.00%
Percent matched by company 3-5 percent of employee salary |  |  | 50.00% | 50.00%
Percent matched by company up to 6 percent of employee salary | 100.00% |  |  |
Matching contributions |  | $ 3,600 | $ 2,300 | $ 1,600
Pension Plan [Member] |  |  |  |
Accumulated benefit obligation |  | $ 36,354 | $ 38,150 | $ 36,840
Expected average annual rate of return |  | 2.75% |  |
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 |  | $ 5,794 | $ 5,970 | $ 5,910

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- Definition The automatic rate of deferral for employees enrolled in a defined contribution plan. + References No definition available. + Details
Name: | fbp_DeferralRate
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Period Type: | duration

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- Definition Expected average annual rate of return. + References No definition available. + Details
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Namespace Prefix: | fbp_
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Balance Type: | na
Period Type: | duration

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- Definition The percent matched by company in the range of 3 to 5 percent of employee salary. + References No definition available. + Details
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- Definition The percent matched by company up to 6 percent of employee salary. + References No definition available. + Details
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- Definition The percent matched by company up to 3 percent of employee salary for the defined contribution plan. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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