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Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 387,932	$ 412,629
Less accumulated depreciation and amortization	(132,780)	(159,824)
Premises and equipment, net	255,152	252,805
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	95,247	98,852
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	185,813	175,390
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	15,698	15,123
Furniture, software and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 91,174	$ 123,264
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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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