Annual report pursuant to Section 13 and 15(d)

Income Taxes (Statutory tax rate impact on Income tax expense) (Details)

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Income Taxes (Statutory tax rate impact on Income tax expense) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
"Expected" statutory tax expense $ 7,437 $ 4,500 $ 6,215
State income taxes, net of federal expense 1,770 1,141 1,129
Income tax effect of nondeductible entertainment expenses 777 737 775
Income tax effect of nondeductible lobbying expenses 298 327 405
Income tax effect of nondeductible officer compensation 1,718 758 722
Other, net 88 (58) 2
Income Tax Expense (Benefit), Total $ 12,088 $ 7,405 $ 9,248