Employee Benefits (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Stock Option Activity and Related Information
Outstanding at December 31, 2011, options	436,939
Outstanding Beginning Balance at December 31, 2011, Weighted Average Exercise Price	$ 11.32
Exercise of Stock Options, Shares	0
Exercised, Weighted Average Exercise Price	$ 0
Forfeited or Expired, Options	0
Forfeited or Expired, Weighted Average Exercise Price	$ 0
Outstanding at December 31, 2012, options	436,939
Outstanding Ending Balance at December 31, 2012, Weighted Average Exercise Price	$ 11.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 11 months 2 days
Outstanding Ending Balance, Aggregate Intrinsic Value	$ 218
Vested and Expected to Vest, Options	5,624
Vested and Expected to Vest, Weighted Average Exercise Price	$ 8.71
Vested and Expected to Vest, Weighted Average Remaining Contractual Life (Years)	6 years 8 months 8 days
Vested and Expected to Vest, Aggregate Intrinsic Value	15
Exercisable, Options	431,315
Exercisable, Weighted Average Exercise Price	$ 11.35
Exercisable, Weighted Average Remaining Contractual Term	3 years 10 months 6 days
Exercisable, Aggregate Intrinsic Value	$ 202

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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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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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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

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

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