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Commitments, Contingencies, and Concentrations of Credit Risk - Narrative (Details) | Dec. 31, 2020 USD ($) county | Dec. 31, 2019 USD ($)
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Loss Contingencies [Line Items] |  |
Bank standby letters of credit | $ 14,100,000 | $ 12,000,000.0
Marketable securities to any one issuer or guarantor, threshold | 5,000,000.0 |
Remaining funding commitments | 6,300,000 |
FDIC-insured, amount | 250,000 |
Federal Home Loan Bank of Atlanta |  |
Loss Contingencies [Line Items] |  |
Deposits | 42,600,000 |
Federal Reserve Bank |  |
Loss Contingencies [Line Items] |  |
Deposits | 230,700,000 |
PCBB |  |
Loss Contingencies [Line Items] |  |
Deposits | $ 2,800,000 |
North Carolina |  |
Loss Contingencies [Line Items] |  |
Number of counties with branch locations | county | 36 |
South Carolina |  |
Loss Contingencies [Line Items] |  |
Number of counties with branch locations | county | 3 |

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