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Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Reclassified amount between Accumulated Other Comprehensive Income and Retained Earnings
Lease liabilities and right-of-use assets	$ 19,400

X

- Definition

Reclassified amount between accumulated other comprehensive income and retained earnings.

+ References

No definition available.

+ Details

Name:	fbp_ReclassifiedAmountBetweenAccumulatedOtherComprehensiveIncomeAndRetainedEarnings
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration