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OTHER BORROWINGS - Components of Other Borrowings (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Fbp Statutory Trust One [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Payments for Repurchase of Trust Preferred Securities |  | $ 23.8 |
due June 17, 2034 [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Floating Interest rate on junior subordinated debentures | 5.08% |  | 4.35%
Subordinated Borrowing Due Date | Jun. 17, 2034 |  |
Callable step-rate notes rate | 2.75% |  |
due June 17, 2034 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument Description Of Variable Rate Basis | 3-month LIBOR |  | 3-month LIBOR
due September 20, 2034 [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Floating Interest rate on junior subordinated debentures | 4.84% |  | 4.12%
Subordinated Borrowing Due Date | Sep. 20, 2034 |  |
Callable step-rate notes rate | 2.50% |  |
due September 20, 2034 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument Description Of Variable Rate Basis | 3-month LIBOR |  | 3-month LIBOR
Junior Subordinated Debt [Member] | Fbp Statutory Trust One [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Payments for Repurchase of Trust Preferred Securities |  | $ 23.8 |

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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow to reacquire preferred stocks issued by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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