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Summary of Significant Accounting Policies - Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Goodwill and Intangible Assets [Roll Forward]    
Goodwill, beginning of period $ 251,653 $ 251,653
Goodwill, Additions 8,624 0
Goodwill, end of period 260,277 251,653
Intangible assets. amortization (1,815) (2,217)
Goodwill and intangible assets, beginning of period 256,076 256,271
Goodwill and intangible assets, additions 10,057 2,022
Goodwill and intangible assets, end of period 264,318 256,076
Service Rights [Member]
    
Goodwill and Intangible Assets [Roll Forward]    
Intangible assets, beginning of period 286 1,246
Intangible assets, additions 0 0
Intangible assets. amortization (286) (960)
Intangible assets, end of period 0 286
Core Deposit [Member]
    
Goodwill and Intangible Assets [Roll Forward]    
Intangible assets, beginning of period 4,137 3,372
Intangible assets, additions 1,433 2,022
Intangible assets. amortization (1,529) (1,257)
Intangible assets, end of period 4,041 4,137
2014 1,600  
2015 1,301  
2016 682  
2017 386  
2018 $ 72