4. Net Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net Earnings Available to Common Shareholders
Basic earnings per common share	$ 2,328	$ 2,578
Effect of dilutive securities: Stock options	0	0
Diluted earnings per common share	$ 2,328	$ 2,578
Common Shares
Basic earnings per common share (in shares)	5,612,588	5,613,495
Effect of dilutive securities: Stock options (in shares)	38,470	19,359
Diluted earnings per common share (in shares)	5,651,058	5,632,854
Per Share Amount
Basic earnings per common share	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic
Diluted earnings per common share	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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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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