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Premises and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 422,384 $ 392,279
Less accumulated depreciation and amortization (174,483) (155,268)
Premises and equipment, net 247,901 237,011
Land    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 88,055 90,726
Buildings    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 203,567 190,707
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 31,729 18,081
Furniture, software and equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 99,033 $ 92,765
Minimum | Buildings    
Property, Plant and Equipment [Line Items]    
Estimated useful life 10 years  
Minimum | Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Estimated useful life 5 years  
Minimum | Furniture, software and equipment    
Property, Plant and Equipment [Line Items]    
Estimated useful life 2 years  
Maximum | Buildings    
Property, Plant and Equipment [Line Items]    
Estimated useful life 40 years  
Maximum | Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Estimated useful life 15 years  
Maximum | Furniture, software and equipment    
Property, Plant and Equipment [Line Items]    
Estimated useful life 10 years