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Nature of Banking Activities and Significant Accounting Policies (Weighted Average Number Of Shares Used In Computing Earnings Per Share) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Nature of Banking Activities and Significant Accounting Policiesl [Abstract]
Average number of common shares outstanding	3,333,235	3,292,290	3,243,292
Effect of dilutive common stock	10,037	7,708	7,576
Average number of common shares outstanding used to calculate diluted earnings per share	3,343,272	3,299,998	3,250,868

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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