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Premises and Equipment (Details) (USD $)
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 237,584,000 $ 218,640,000  
Accumulated depreciation (58,739,000) (52,047,000)  
Premises and equipment, net 178,845,000 166,593,000  
Future minimum payments due, current 3,300,000    
Future minimum payments due, two years 2,600,000    
Future minimum payments due, three years 2,000,000    
Future minimum payments due, four years 1,100,000    
Future minimum payments due, five years and thereafter 2,600,000    
Rental expense 3,825,000 3,083,000 3,170,000
Land [Member]
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 82,426,000 78,282,000  
Building [Member]
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 114,106,000 102,403,000  
Leasehold Improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 7,530,000 6,919,000  
Furniture, Fixtures and Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 33,522,000 $ 31,036,000  
Minimum [Member] | Building [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 25 years    
Minimum [Member] | Leasehold Improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 7 years    
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 2 years    
Maximum [Member] | Building [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 40 years    
Maximum [Member] | Leasehold Improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 15 years    
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum 10 years