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DEPOSITS - Narratives (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deposits [Line Items] |  |  |
weighted average interest rate on total interest-bearing deposits | 0.97% | 0.86% |
Overdrafts in demand deposits that were reclassified as loans | $ 1,700,000 | $ 1,000,000 |
Overdrafts Prearranged Lines Of Credit | 15,200,000 | 32,900,000 |
CDs in denominations of $100,000 or higher | 2,800,000,000 | 3,000,000,000 |
Brokered certificates of deposit | 1,150,485,000 | 1,439,697,000 |
Unamortized broker placement fees | 2,200,000 | 2,600,000 |
Deposits | 9,022,631,000 | 8,831,205,000 |
Amortization Of Broker Placement Fees | 1,900,000 | 2,881,000 | $ 4,563,000
Certificate Of Deposits Denominations | 100,000 |  |
Accretion Of Premium From Acquisitions | 100,000 | 200,000 | $ 600,000
Amortized Cost [Member] |  |  |
Deposits [Line Items] |  |  |
Deposit Liabilities Collateral Issued Financial Instruments | 562,500,000 | 583,900,000 |
Market Value [Member] |  |  |
Deposits [Line Items] |  |  |
Deposit Liabilities Collateral Issued Financial Instruments | $ 542,900,000 | $ 521,300,000 |
Brokered Certificate of Deposits [Member] |  |  |
Deposits [Line Items] |  |  |
Weighted Average Interest Rate of Time Deposits, $100,000 or More | 1.50% | 1.18% |
Government [Member] |  |  |
Deposits [Line Items] |  |  |
Deposits | $ 652,000,000 | $ 563,700,000 |
Government [Member] | Puerto Rico [Member] |  |  |
Deposits [Line Items] |  |  |
Deposits | 490,300,000 | 408,800,000 |
Government [Member] | Virgin Islands [Member] |  |  |
Deposits [Line Items] |  |  |
Deposits | $ 161,700,000 | $ 154,900,000 |

X
- Definition This item represents the accretion of premium from core deposit intangible acquired. + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amortization of broker placement fees + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Denominations of certificate of deposits. + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deposits [Line Items] + References No definition available. + Details
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X
- Definition Amounts of deposits held by the entity, for which overdrafts are pre-arranged as lines of credit. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition unamortized amount of costs for brokerage fees paid for issuance of brokered CDs. + References No definition available. + Details
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Namespace Prefix: | fbp_
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Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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X
- Definition Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 + Details
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X
- Definition Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 + Details
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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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X
- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
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- Definition Weighted average interest rate calculated at point in time for domestic deposit liability. + References No definition available. + Details
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- Details
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