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Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Pre-1988 tax bad debt reserve	$ 6.9	$ 6.9	$ 6.9

X

- Definition

The amount of pre-1988 tax bad debt reserve base years amounts included in retained earnings.

+ References

No definition available.

+ Details

Name:	fbnc_Pre1988TaxBadDebtReserve
Namespace Prefix:	fbnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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