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Nature of Banking Activities and Significant Accounting Policies (Weighted Average Number of Shares Used In Computing Earnings Per Share) (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Weighted average number of common shares outstanding used to calculate basic earnings per share (in shares) 3,467,667 3,468,275 3,518,848
Effect of dilutive common stock (in shares) 0 0 0
Weighted average number of common shares outstanding used to calculate diluted earnings per share (in shares) 3,467,667 3,468,275 3,518,848