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Summary of Significant Accounting Policies - Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Goodwill and Intangible Assets [Roll Forward]    
Goodwill, beginning of period $ 260,277 $ 251,653
Goodwill, additions 31,226 8,624
Goodwill, end of period 291,503 260,277
Intangible assets. amortization (3,675) (1,815)
Goodwill and intangible assets, beginning of period 264,318 256,076
Goodwill and intangible assets, additions 42,266 10,057
Goodwill and intangible assets, end of period 302,909 264,318
Service Rights [Member]
    
Goodwill and Intangible Assets [Roll Forward]    
Intangible assets, beginning of period 0 286
Intangible assets, additions 0 0
Intangible assets. amortization 0 (286)
Intangible assets, end of period 0 0
Core Deposit [Member]
    
Goodwill and Intangible Assets [Roll Forward]    
Intangible assets, beginning of period 4,041 4,137
Intangible assets, additions 11,040 1,433
Intangible assets. amortization (3,675) (1,529)
Intangible assets, end of period 11,406 4,041
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2015 3,479  
2016 2,314  
2017 1,607  
2018 1,208  
2019 $ 1,254