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Banking Premises and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Land	$ 13,631	$ 12,440
Banking premises	72,362	59,708
Furniture, fixtures and equipment	52,128	45,660
Leasehold improvements	37,756	35,749
Construction in progress	9,669	3,270
Banking premises and equipment, gross	185,546	156,827
Less accumulated depreciation and amortization	109,600	101,617
Banking premises and equipment, net	75,946	55,210
Depreciation expense	$ 7,600	$ 7,700	$ 8,000

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 of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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