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Summary of Significant Accounting Policies - Purchased Credit Deteriorated Loans (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($)
Accounting Policies [Abstract] |
Credit loss expense recognized upon acquisition of a PCD loan | $ 0

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- Definition Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss, Purchased With Credit Deterioration, Increase + References No definition available. + Details
Name: | fbnc_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease
Namespace Prefix: | fbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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