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Regulatory Restrictions - Narrative (Details)	Dec. 31, 2025 USD ($)
Regulatory Restrictions [Abstract]
Restricted investment in bank	$ 1,100,000,000
Average reserve balance	$ 0

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- Definition

Regulatory Restrictions

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No definition available.

+ Details

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Namespace Prefix:	fbnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

The amount of restricted investment in bank as to transfer to the company without obtaining prior regulatory approval.

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No definition available.

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Name:	fbnc_RestrictedInvestmentInBank
Namespace Prefix:	fbnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers).

+ References

No definition available.

+ Details

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