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Commitments, Contingencies, and Concentrations of Credit Risk (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Bank Standby Letters of credit | $ 15,200 | $ 12,700
Marketable securities to any one issuer or guarantor, threshold | 2,000 |
FDIC-insured, amount | 250 | $ 250
Federal Home Loan Bank of Atlanta [Member] |  |
Deposits | 3,800 |
Federal Reserve Bank [Member] |  |
Deposits | 368,400 |
PCBB [Member] |  |
Deposits | 100 |
Bank of America [Member] |  |
Deposits | $ 55,400 |

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