Bank Premises and Equipment - Summary of Bank Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Cost	$ 134,227	$ 120,384
Accumulated Depreciation & Amortization	(59,110)	(53,769)
Net Carrying Value	75,117	66,615
Land	22,586	18,546
Premises
Property, Plant and Equipment [Line Items]
Cost	95,852	83,020
Accumulated Depreciation & Amortization	(28,999)	(26,180)
Net Carrying Value	66,853	56,840
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Cost	38,375	37,364
Accumulated Depreciation & Amortization	(30,111)	(27,589)
Net Carrying Value	$ 8,264	$ 9,775

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 depletion of real estate held for productive use, excluding land held for sale.

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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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