PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 89,554	$ 84,208
Less: accumulated depreciation	34,342	30,777
Premises and equipment, net	55,212	53,431
Land
Property Plant And Equipment [Line Items]
Premises and equipment, gross	10,944	10,944
Building and improvements
Property Plant And Equipment [Line Items]
Premises and equipment, gross	58,569	54,809
Furniture, fixtures and equipment
Property Plant And Equipment [Line Items]
Premises and equipment, gross	19,641	17,960
Automobiles
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 400	$ 495