OTHER BORROWINGS - Components of Other Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Subordinated Borrowing [Line Items]
Junior subordinated debentures	$ 183,762	$ 184,150
Junior Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures	183,762	184,150
Junior Subordinated Debt [Member] \| due June 17, 2034 [Member] \| Fbp Statutory Trust One [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures	65,205	65,593
Junior Subordinated Debt [Member] \| due September 20, 2034 [Member] \| Fbp Statutory Trust Two [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debentures	$ 118,557	$ 118,557

Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant