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Financial Instruments with Off-Balance-Sheet Risk (Schedule of Financial Instruments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Commitments to extend credit $ 3,959 $ 27,144
Unfunded commitments under lines of credit 108,483 100,530
Commercial and standby letters of credit 8,437 $ 5,897
Collateralized Letters Of Credit Outstanding 7,500  
Excess of insurance limits held in cash accounts $ 1,700