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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Taxes
Income tax expense	$ 5,738	$ 4,906	$ 11,324	$ 9,597
Effective tax rates on pretax income	25.80%	25.70%	25.70%	25.60%
Effective tax rates differ from the statutory federal tax rate due to tax exempt interest income			35.00%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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