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Commitments, Contingencies, and Concentrations of Credit Risk (Narrative) (Details) $ in Thousands	Dec. 31, 2019 USD ($) county	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Bank standby letters of credit	$ 12,000	$ 15,700
Marketable securities to any one issuer or guarantor, threshold	5,000
Remaining funding commitments	2,700
FDIC-insured, amount	250
Federal Home Loan Bank of Atlanta
Loss Contingencies [Line Items]
Deposits	22,300
Federal Reserve Bank
Loss Contingencies [Line Items]
Deposits	118,600
PCBB
Loss Contingencies [Line Items]
Deposits	$ 2,800
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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
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