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Loans, Allowance for Credit Losses, and Asset Quality Information - Unfunded Loan Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 78,789 | $ 52,388 | $ 52,388
Charge-offs | (1,043) | (2,317) | (7,602)
Recoveries | 823 | 1,203 | 4,922
Reversal of provision for unfunded commitments | 3,500 | 0 | 9,611
Ending balance | 82,069 | $ 65,849 | 78,789
Unfunded Loan Commitment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 13,506 |  |
Charge-offs | 0 |  |
Recoveries | 0 |  |
Reversal of provision for unfunded commitments | (1,500) |  |
Ending balance | $ 12,006 |  | $ 13,506

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- Definition Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss, Recovery + References No definition available. + Details
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Namespace Prefix: | fbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss, Writeoff + References No definition available. + Details
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Namespace Prefix: | fbnc_
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- Definition Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) + References No definition available. + Details
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Namespace Prefix: | fbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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