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Premises and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 386,819 $ 361,216  
Less accumulated depreciation and amortization (104,868) (84,969)  
Premises and equipment, net 281,951 276,247  
Future minimum payments due, current 4,902    
Future minimum payments due, two years 3,942    
Future minimum payments due, three years 3,422    
Future minimum payments due, four years 3,228    
Future minimum payments due, five years 2,538    
Future minimum payments due, thereafter 13,159    
Rental expense 5,300 6,600 $ 6,600
Land      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 109,414 113,347  
Buildings      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 143,841 147,757  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 18,365 10,193  
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 115,199 $ 89,919  
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