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Stock Based Incentive Plan - Certain Information Regarding Restricted Stock (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Certain information regarding restricted stock
Shares granted	71,157
Weighted average grant date fair value	$ 15.29
Restricted Stock [Member]
Certain information regarding restricted stock
Shares granted	71,157	58,736	67,982
Weighted average grant date fair value	$ 15.29	$ 17.34	$ 17.62
Intrinsic value of awards vested	$ 625	$ 183	$ 138

The intrinsic value of equity-based payment equity instruments, excluding stock or unit options, granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

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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