Banking location.

No definition available.

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Namespace Prefix:	fbp_
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Balance Type:	na
Period Type:	duration

- Definition

Maximum Number of shares exchange.

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
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Balance Type:	na
Period Type:	duration

- Definition

Maximum Number of shares exchange not be exceed.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

The number of shares to be received per the merger agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of total outstanding shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Shareholders received cash per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of financial assets (as defined) recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-Glossary Financial Asset
-URI http://asc.fasb.org/extlink&oid=6512957

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
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Subsequent Event - Entry Into an Acquisition Agreement (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	May 01, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($)	Apr. 28, 2017 $ / shares	Mar. 03, 2017 $ / shares
Closing stock price \| $ / shares				$ 30.13
Asheville Savings Bank [Member]
Banking location		13
Assets		$ 803,000
Gross loan		606,000
Deposits		$ 682,000
Subsequent Event [Member] \| Asheville Savings Bank [Member]
Cash and Stock transaction value	$ 175,000
Closing stock price \| $ / shares			$ 43.12
Subsequent Event [Member] \| Asheville Savings Bank [Member] \| First Bancorp Plans [Member]
Shareholders received shares per share \| shares	1.44
Shareholders received cash per share \| $ / shares	$ 41.90
Percentage of total outstanding shares	90.00%
Maximum Number of shares exchange	10.00%
Maximum Number of shares exchange not be exceed	19.90%