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Commitments, Contingencies, and Concentrations of Credit Risk (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Bank Standby Letters of credit | $ 15,700 | $ 15,200
Marketable securities to any one issuer or guarantor, threshold | 5,000 |
FDIC-insured, amount | 250 |
Federal Home Loan Bank of Atlanta [Member] |  |
Deposits | 135,400 |
Federal Reserve Bank [Member] |  |
Deposits | 246,200 |
PCBB [Member] |  |
Deposits | $ 200 |

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