Premises and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 685,139	$ 621,976
Accumulated depreciation and amortization	(343,509)	(334,271)
Total premises and equipment, net	341,630	287,705
Depreciation and amortization	27,600	24,800	$ 24,400
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	93,600	77,235
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	250,510	210,335
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	77,425	79,217
Furniture and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 263,604	$ 255,189

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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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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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.

+ References

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