Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 2)

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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income tax expense difference in income tax rate to pretax income      
Computed expected tax expense $ 17,411 $ 14,600 $ 11,027
(Decrease) in taxes resulting from:      
Tax-exempt interest income, net (2,614) (2,681) (2,513)
Other, net (464) (655) 69
Income tax expense $ 14,333 $ 11,264 $ 8,583