| 
           Income Taxes (Schedule 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 
         | 
      |
| Current: | |||||||||||
| Federal income tax | $ 2,508 | $ 3,696 | $ 4,141 | ||||||||
| State income tax | 458 | 1,298 | 726 | ||||||||
| Total current | 2,966 | 4,994 | 4,867 | ||||||||
| Deferred: | |||||||||||
| Federal income tax | 7,921 | 5,617 | 608 | ||||||||
| State income tax | 1,142 | 362 | (45) | ||||||||
| Total deferred | 9,063 | 5,979 | 563 | ||||||||
| 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 | 
| X | ||||||||||
| 
             
- Definition 
          Deferred Income Tax Expense (Benefit), Tax Note. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  |