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Premises and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 330,681 $ 270,591  
Less accumulated depreciation and amortization (73,138) (64,419)  
Premises and equipment, net 257,543 206,172  
Future minimum payments due, current 6,221    
Future minimum payments due, two years 4,179    
Future minimum payments due, three years 3,154    
Future minimum payments due, four years 2,593    
Future minimum payments due, five years and thereafter 12,281    
Rental expense 6,600 4,680 3,825
Land
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 113,353 92,560  
Buildings
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 143,627 132,822  
Leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 8,547 8,411  
Capitalized software
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 11,557 0  
Estimated useful life 5 years 5 years  
Furniture, fixtures and equipment
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 53,597 $ 36,798  
Minimum | Buildings
      
Property, Plant and Equipment [Line Items]      
Estimated useful life 25 years 25 years  
Minimum | Leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Estimated useful life 7 years 7 years  
Minimum | Furniture, fixtures and equipment
      
Property, Plant and Equipment [Line Items]      
Estimated useful life 2 years 2 years  
Maximum | Buildings
      
Property, Plant and Equipment [Line Items]      
Estimated useful life 40 years 40 years  
Maximum | Leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Estimated useful life 15 years 15 years  
Maximum | Furniture, fixtures and equipment
      
Property, Plant and Equipment [Line Items]      
Estimated useful life 10 years 10 years