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Regulatory Restrictions (Narrative) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Banking and Thrift [Abstract]
Restricted investment in bank	$ 587,400
Average reserve balance	$ 3,802

X

- Definition

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

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

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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