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Premises and Equipment (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 270,591,000 $ 237,584,000  
Less accumulated depreciation and amortization (64,419,000) (58,739,000)  
Premises and equipment, net 206,172,000 178,845,000  
Future minimum payments due, current 4,200,000    
Future minimum payments due, two years 3,500,000    
Future minimum payments due, three years 2,500,000    
Future minimum payments due, four years 1,800,000    
Future minimum payments due, five years and thereafter 6,600,000    
Rental expense 4,680,000 3,825,000 3,083,000
Land
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 92,560,000 82,426,000  
Buildings
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 132,822,000 114,106,000  
Leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 8,411,000 7,530,000  
Furniture, fixtures and equipment
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 36,798,000 $ 33,522,000  
Minimum | Buildings
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 25 years    
Minimum | Leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 7 years    
Minimum | Furniture, fixtures and equipment
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 2 years    
Maximum | Buildings
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 40 years    
Maximum | Leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 15 years    
Maximum | Furniture, fixtures and equipment
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 10 years