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PREMISES AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Premises and equipment
Premises and equipment, gross	$ 200,437	$ 176,807
Accumulated depreciation and amortization	(78,966)	(68,440)
Premises and equipment, net	121,471	108,367
Depreciation and amortization expense	11,800	10,800	$ 9,900
Land
Premises and equipment
Premises and equipment, gross	17,816	14,096
Buildings and improvements
Premises and equipment
Premises and equipment, gross	$ 116,997	105,190
Buildings and improvements | Minimum
Premises and equipment
Estimated Useful Life	5 years
Buildings and improvements | Maximum
Premises and equipment
Estimated Useful Life	39 years
Furniture and equipment
Premises and equipment
Premises and equipment, gross	$ 64,044	56,207
Furniture and equipment | Minimum
Premises and equipment
Estimated Useful Life	3 years
Furniture and equipment | Maximum
Premises and equipment
Estimated Useful Life	7 years
Construction in process
Premises and equipment
Premises and equipment, gross	$ 1,580	1,314
Discontinued Operations
Premises and equipment
Premises and equipment, net	1,073	1,867
Continuing Operations
Premises and equipment
Premises and equipment, net	$ 120,398	$ 106,500

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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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