PREMISES AND EQUIPMENT (Details)	1 Months Ended	12 Months Ended
	Jul. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	May 17, 2016 item
PREMISES AND EQUIPMENT
Total premises and equipment		$ 98,662,000	$ 78,398,000
Less: Accumulated depreciation and amortization		55,793,000	47,292,000
Premises and equipment, net		$ 42,869,000	31,106,000
Number of banking centers held for sale | item		3
Depreciation expense		$ 7,495,000	6,742,000	$ 6,363,000
Land
PREMISES AND EQUIPMENT
Total premises and equipment		6,365,000	3,055,000
Buildings and improvements
PREMISES AND EQUIPMENT
Total premises and equipment		36,140,000	25,447,000
Furniture, fixtures and equipment
PREMISES AND EQUIPMENT
Total premises and equipment		38,911,000	34,066,000
Leasehold improvements
PREMISES AND EQUIPMENT
Total premises and equipment		17,246,000	$ 15,830,000
Cornerstone
PREMISES AND EQUIPMENT
Number of former banking centers acquired | item					2
Cornerstone | Banking Centers Held for Sale
PREMISES AND EQUIPMENT
Premises and equipment, net		$ 2,000,000
Kentucky | Premises
PREMISES AND EQUIPMENT
Premises and equipment, net	$ 1,000,000
Gain on the transaction	$ 28,000