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
Stockholders Equity After New Accounting Principle In Period Of Adoption	fbp_StockholdersEquityAfterNewAccountingPrincipleInPeriodOfAdoption	0
Stockholders Equity After New Accounting Principle In Period Of Adoption	fbp_StockholdersEquityAfterNewAccountingPrincipleInPeriodOfAdoption	0
Stockholders Equity After New Accounting Principle In Period Of Adoption	fbp_StockholdersEquityAfterNewAccountingPrincipleInPeriodOfAdoption	1,159,828,000
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	0
Cumulative Effect Of New Accounting Principle In Period Of Adoption 1	fbp_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption1	(62,322,000)
Cumulative Effect Of New Accounting Principle In Period Of Adoption 1	fbp_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption1	0
Cumulative Effect Of New Accounting Principle In Period Of Adoption 1	fbp_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption1	$ 0