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Commitments, Contingencies, and Concentrations of Credit Risk (Schedule of Outstanding Loan Commitments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Outstanding closed-end loan commitments	$ 670,103
Unfunded commitments on revolving lines of credit, credit cards and home equity loans	618,691
Commitments, total	1,288,794
Fixed Rate [Member]
Outstanding closed-end loan commitments	209,726
Unfunded commitments on revolving lines of credit, credit cards and home equity loans	149,898
Commitments, total	359,624
Variable Rate [Member]
Outstanding closed-end loan commitments	460,377
Unfunded commitments on revolving lines of credit, credit cards and home equity loans	468,793
Commitments, total	$ 929,170

X

- Definition

The total amount of off-balance sheet lending-related financial instruments (e.g., commitments), which represents the maximum possible credit risk should the counterparty draw upon the commitment.

+ References

No definition available.

+ Details

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

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- Definition

The off-balance sheet contractual amount of lending-related commitments for closed-end loans.

+ References

No definition available.

+ Details

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

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- Definition

The off-balance sheet amount of unfunded revolving lines of credit, credit cards and home equity loan commitments.

+ References

No definition available.

+ Details

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

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- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=fbp_FixedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=fbp_VariableRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: