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Commitments, Contingencies, and Concentrations of Credit Risk (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Bank Standby Letters of credit | $ 12,700 | $ 13,100
Marketable securities to any one issuer or guarantor, threshold | 2,000 |
FDIC-insured, amount | 250 |
Federal Home Loan Bank of Atlanta [Member] |  |
Deposits | 4,100 |
Federal Reserve Bank [Member] |  |
Deposits | 230,100 |
PCBB [Member] |  |
Deposits | 100 |
Bank of America [Member] |  |
Deposits | $ 40,900 |

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