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Premises and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 361,216 $ 330,681  
Less accumulated depreciation and amortization (84,969) (73,138)  
Premises and equipment, net 276,247 257,543  
Future minimum payments due, current 5,272,281    
Future minimum payments due, two years 3,992,307    
Future minimum payments due, three years 3,279,576    
Future minimum payments due, four years 2,608,795    
Future minimum payments due, five years 2,245,791    
Future minimum payments due, thereafter 8,941,391    
Rental expense 6,600 6,600 $ 4,680
Land      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 113,347 113,353  
Buildings      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 147,757 143,627  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 10,193 8,547  
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 89,919 $ 65,154  
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