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Summary of Significant Accounting Policies - SBA Loans (Details)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
SBA loan, amortization period	25 years

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- Definition

SBA Loan, Amortization Period

+ References

No definition available.

+ Details

Name:	fbnc_SBALoanAmortizationPeriod
Namespace Prefix:	fbnc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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