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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

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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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

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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

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- Definition

Date the payments are due on subordinated debt, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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