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Bank Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Bank premises and equipment
Less: accumulated depreciation	$ (542,159)	$ (526,939)
Bank premises and equipment, net	447,082	479,878
Bank buildings and improvements [Member]
Bank premises and equipment
Bank premises and equipment, gross	$ 573,276	577,656
Bank buildings and improvements [Member] | Minimum
Bank premises and equipment
Estimated useful lives	5 years
Bank buildings and improvements [Member] | Maximum [Member]
Bank premises and equipment
Estimated useful lives	39 years
Furniture equipment and Vehicles [Member]
Bank premises and equipment
Bank premises and equipment, gross	$ 302,847	311,313
Furniture equipment and Vehicles [Member] | Minimum
Bank premises and equipment
Estimated useful lives	1 year
Furniture equipment and Vehicles [Member] | Maximum [Member]
Bank premises and equipment
Estimated useful lives	20 years
Land [Member]
Bank premises and equipment
Bank premises and equipment, gross	$ 113,118	$ 117,848

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- 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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