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Commitments, Contingencies, and Concentrations of Credit Risk (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Bank Standby Letters of credit	$ 12,700	$ 13,100
Marketable securities to any one issuer or guarantor, threshold	2,000
FDIC-insured, amount	250
Federal Home Loan Bank of Atlanta [Member]
Deposits	4,100
Federal Reserve Bank [Member]
Deposits	230,100
PCBB [Member]
Deposits	100
Bank of America [Member]
Deposits	$ 40,900

X

- Definition

Guarantee made on behalf of the company's customers to suppliers to guarantee payment from the customer.

+ References

No definition available.

+ Details

Name:	fbp_BankStandbyLettersOfCredit
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For banks and other depository institutions: Interest-bearing and noninterest bearing deposits in other financial institutions.

+ References

No definition available.

+ Details

Name:	fbp_DepositsOther
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The threshold for marketable securities issued to any one guarantor.

+ References

No definition available.

+ Details

Name:	fbp_MarketableSecuritiesToAnyOneIssuerOrGuarantorThreshold
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashFDICInsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=fbp_FederalHomeLoanBankAtlantaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=fbp_FederalReserveBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=fbp_PCBBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=fbp_BankAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: