Stock Based Compensation Plans (Details 1) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted Stock Rights [Member]
A summary of stock options and restricted stock rights for the Plans
Restricted Stock Right, Beginning Balance	156,348	142,703
Restricted Stock Right Weighted Average Fair Value, Beginning Balance	$ 18.97	$ 14.96
Restricted Stock Right Grants in Period	72,038	64,121
Restricted Stock Right Weighted Average Grant Date Fair Value	$ 27.97	$ 26.46
Restricted Stock Right Options exercised	(57,299)	(44,255)
Restricted Stock Right vested	$ 29.97	$ 26.73
Restricted Stock Right Forfeited in Period	(7,320)	(6,221)
Restricted Stock Right Weighted Average Grant Date Fair Value	$ 23.03	$ 23.96
Restricted Stock Option, Ending Balance	163,767	156,348
Restricted Stock Option Weighted Average Fair Value, Ending Balance Balance	$ 22.99	$ 18.97
Stock Options [Member]
A summary of stock options and restricted stock rights for the Plans
Outstanding, Number, Beginning Balance	253,727	275,420
Outstanding, shares, Weighted Average Exercise Price, Beginning Balance	$ 31.27	$ 33.76
Outstanding, Weighted Average Remaining Contractual Term, beginning	5 years 6 months 26 days	5 years 11 months 12 days	6 years 4 days
Outstanding, Intrinsic Value, Beginning	$ 1,058,206	$ 577,352
Options and stock rights granted, Weighted average exercise price	$ 22.28	$ 26.32
Options and stock rights granted, shares	285,510	23,202
Options exercised/stock rights vested	(6,090)	(3,588)
Options exercised/stock rights vested, Weighted average exercise price	$ 13.68	$ 23.21
Options expired	(202,868)	(36,885)
Options expired, Weighted Average Exercise Price	$ 34.45	$ 48.17
Options and stock rights forfeited	(76,963)	(4,422)
Options and stock rights forfeited, Weighted Average Exercise Price	$ 24.19	$ 25.54
Outstanding, Weighted Average Remaining Contractual Term, ending	5 years 6 months 26 days	5 years 11 months 12 days	6 years 4 days
Outstanding, Intrinsic Value, Ending	2,140,466	1,058,206	577,352
Outstanding, Number, Ending Balance	253,316	253,727	275,420
Outstanding, shares, Weighted Average Exercise Price, Ending Balance	$ 21.17	$ 31.27	$ 33.76
Exercisable, shares	177,274
Exercisable, Weighted Average Exercise Price	$ 23.85
Exercisable, Weighted Average Remaining Contractual Term	4 years 9 months 7 days
Exercisable, Intrinsic Value	$ 1,223,205

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including 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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 of the plan that expired.

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