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Significant Accounting Policies Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Goodwill and Intangible Assets [Roll Forward]  
Goodwill, beginning of period$ 251,653$ 251,653
Goodwill, Additions00
Goodwill, end of period251,653251,653
Goodwill and intangible assets, beginning of period257,718256,797
Goodwill and intangible assets, additions03,064
Goodwill and intangible assets, end of period256,271257,718
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)1,4472,143
Service Rights [Member]
  
Goodwill [Line Items]  
Finite-Lived Intangible Assets, Useful Life5 
Goodwill and Intangible Assets [Roll Forward]  
Intangible assets, beginning of period1,7752,469
Intangible assets, additions00
Intangible assets, end of period1,2461,775
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)529694
Core Deposit [Member]
  
Goodwill and Intangible Assets [Roll Forward]  
Intangible assets, beginning of period4,2902,675
Intangible assets, additions03,064
Intangible assets, end of period3,3724,290
2012918 
2013918 
2014918 
2015618 
20160 
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)$ 918$ 1,449
Core Deposit 1 [Member]
  
Goodwill [Line Items]  
Finite-Lived Intangible Assets, Useful Life7 
Core Deposit 2 [Member]
  
Goodwill [Line Items]  
Finite-Lived Intangible Assets, Useful Life8