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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |
Pre-1988 tax bad debt reserve | $ 6.9 | $ 6.9

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- 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

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration