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Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings per basic and diluted weighted average common share outstanding
Net income	$ 9,506	$ 4,734
Basic weighted-average common shares outstanding	9,437	9,369
Effect of potentially dilutive common shares	47	43
Diluted weighted-average common shares outstanding	9,484	9,412
Earnings per common share:
Earnings per basic common share	$ 1.01	$ 0.51
Earnings per diluted common share	$ 1.00	$ 0.50
Antidilutive shares not included in diluted common share calculation	10	34

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