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Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Goodwill and Intangible Assets [Roll Forward]    
Goodwill, beginning of period $ 291,503 $ 260,277
Goodwill, additions 0 31,226
Goodwill, end of period 291,503 291,503
Intangible assets. amortization (3,551) (3,675)
Goodwill and intangible assets, beginning of period 302,909 264,318
Goodwill and intangible assets, additions 0 42,266
Goodwill and intangible assets, end of period 299,358 302,909
Core Deposit [Member]    
Goodwill and Intangible Assets [Roll Forward]    
Intangible assets, beginning of period 11,406 4,041
Intangible assets, additions 0 11,040
Intangible assets. amortization (3,551) (3,675)
Intangible assets, end of period 7,855 $ 11,406
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2016 2,314  
2017 1,607  
2018 1,208  
2019 1,254  
2020 $ 1,254