PREMISES AND EQUIPMENT (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
PREMISES AND EQUIPMENT
Total premises and equipment	$ 109,300,000	$ 102,332,000
Less: Accumulated depreciation and amortization	63,940,000	59,206,000
Premises and equipment, net	$ 45,360,000	43,126,000
Number of banking centers sold | item	1
Gain (loss) from disposal of bank premises and equipment	$ 339,000	(14,000)
Depreciation expense	9,230,000	9,347,000	$ 8,472,000
Land
PREMISES AND EQUIPMENT
Total premises and equipment	3,818,000	4,185,000
Buildings and improvements
PREMISES AND EQUIPMENT
Total premises and equipment	33,819,000	35,264,000
Furniture, fixtures and equipment
PREMISES AND EQUIPMENT
Total premises and equipment	48,782,000	43,245,000
Leasehold improvements
PREMISES AND EQUIPMENT
Total premises and equipment	20,649,000	$ 19,638,000
Construction in progress
PREMISES AND EQUIPMENT
Total premises and equipment	2,232,000
Banking Centers Held for Sale
PREMISES AND EQUIPMENT
Premises and equipment, net	$ 836,000
Number of banking centers held for sale | item	2	3
Florida
PREMISES AND EQUIPMENT
Gain (loss) from disposal of bank premises and equipment	$ 339,000	$ (14,000)
Florida | Banking Centers Held for Sale
PREMISES AND EQUIPMENT
Number of banking centers held for sale | item	2