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Stock Based Compensation (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Stock Based Compensation [Abstract]
Options, beginning of year	199,825	208,700
Options, Granted	33,750	26,750
Options, Exercised	(15,530)	(32,350)
Options, Forfeited	(2,075)	(3,275)
Options, end of year	215,970	199,825
Options, Exercisable, end of period	182,220	173,075
Weighted Average Exercise Price Per Share, Outstanding, beginning of period	$ 24.78	$ 22.54
Weighted Average Exercise Price Per Share, Granted	26.93	36.02
Weighted Average Exercise Price Per Share, Exercised	17.25	19.71
Weighted Average Exercise Price Per Share, Forfeited	16.83	24.31
Weighted Average Exercise Price Per Share, Outstanding, end of period	25.73	24.78
Weighted Average Exercise Price Per Share, Exercisable, end of period	$ 25.51	$ 23.04
Aggregate Intrinsic Value, Outstanding, beginning of period	$ 2,822,470
Aggregate Intrinsic Value, Outstanding, end of period	742,738	$ 2,822,470
Aggregate Intrinsic Value, Exercisable at end of period	$ 742,738	$ 2,745,430

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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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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.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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