Stock Based Compensation (Stock Options Activity) (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Stock Based Compensation [Abstract]
Outstanding at beginning of year, Number of Shares	292,267	318,002
Exercised, Number of Shares		(8,750)
Expired/Forfeited, Number of Shares	(15,000)
Outstanding at end of year, Number of Shares	277,267	309,252
Outstanding at beginning of year, Weighted Average Exercise Price	$ 10.13	$ 9.21
Exercised, Weighted Average Exercise Price		$ 6.86
Expired/Forfeited, Weighted Average Exercise Price	$ 13.86
Outstanding at end of year, Weighted Average Exercise Price	$ 9.93	$ 9.97
Outstanding, Weighted Average Remaining Contractual Term	5 years 4 months 24 days	6 years 1 month 6 days
Outstanding, Aggregate Grant Date Fair Value	$ 2,753,697	$ 3,083,652
Exercisable, Number of Shares	257,142	236,190
Exercisable, Weighted Average Exercise Price	$ 10.06	$ 10.32
Exercisable, Weighted Average Remaining Contractual Term	5 years 3 months 18 days	5 years 6 months
Exercisable, Aggregate Grant Date Fair Value	$ 2,587,062	$ 2,437,555

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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