Annual report pursuant to section 13 and 15(d)

Income Taxes (Schedule of Computation of Provision for Income Taxes (Benefit)) (Details)

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Income Taxes (Schedule of Computation of Provision for Income Taxes (Benefit)) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Income Taxes [Abstract]                      
Tax at the statutory federal rate                 $ 11,086 $ 10,312 $ 4,259
State income taxes, net of federal benefit                 1,067 1,051 460
Federal impacts from IRS exam and tax return amendments                 19 (444) 713
Deferred rate adjustment                    (313)   
Permanent and other reconciling items, net                 (143) 367 (2)
Total provision for income taxes $ 7,027 $ 2,566 $ 1,800 $ 636 $ (692) $ 5,919 $ 4,515 $ 1,231 $ 12,029 $ 10,973 $ 5,430