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4. Net Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Earnings Available to Common Shareholders
Basic earnings per common share	$ 2,624	$ 2,551	$ 4,952	$ 5,130
Effect of dilutive securities: Stock options	0	0	0	0
Diluted earnings per common share	$ 2,624	$ 2,551	$ 4,952	$ 5,130
Common Shares
Basic earnings per common share (in shares)	5,574,915	5,616,008	5,593,648	5,614,758
Effect of dilutive securities: Stock options (in shares)	44,910	25,471	41,708	22,432
Diluted earnings per common share (in shares)	5,619,825	5,641,479	5,635,356	5,637,190
Per Share Amount
Basic earnings per common share	$ 0.47	$ 0.45	$ 0.89	$ 0.91
Diluted earnings per common share	$ 0.47	$ 0.45	$ 0.88	$ 0.91

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Earnings Per Share, Per Share Amount, Reconciliation [Abstract]

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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