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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current      
Federal $ 14,856 $ 10,047 $ 6,349
State 2,885 2,038 1,151
Current Income tax expense (benefit), Total 17,741 12,085 7,500
Deferred      
Federal 2,396 (1,039) 1,421
State 291 (287) 322
Deferred Income tax expense (benefit), Total 2,687 (1,326) 1,743
Income tax expense $ 20,428 $ 10,759 $ 9,243