Label	Element	Value
Accounting Standards Update 2016-13 [Member] \| Retained Earnings [Member]
Stockholders Equity After New Accounting Principle In Period Of Adoption	fbp_StockholdersEquityAfterNewAccountingPrincipleInPeriodOfAdoption	$ 1,159,495,000
Accounting Standards Update 2016-13 [Member] \| Cumulative Effect Period Of Adoption Adjustment [Member] \| Retained Earnings [Member]
Cumulative Effect Of New Accounting Principle In Period Of Adoption 1	fbp_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption1	(62,322,000)
Stockholders Equity After New Accounting Principle In Period Of Adoption	fbp_StockholdersEquityAfterNewAccountingPrincipleInPeriodOfAdoption	$ 1,159,495,000

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent, as adjusted for new accounting principle in period of adoption. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

No definition available.

Name:	fbp_StockholdersEquityAfterNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant