GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Beginning of year	$ 35,371	$ 33,796	$ 33,796
Acquired goodwill	0	1,575	0
Impairment	0	0	0
End of year	35,371	35,371	33,796
Acquired Finite-Lived Intangible Assets [Line Items]
Aggregate intangible amortization expense	974	1,139	$ 853
Estimated amortization expense [Abstract]
2018	711
2019	495
2020	475
2021	473
2022	334
Thereafter	887
Total	3,375	4,349
Core Deposits [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,046	8,758
Accumulated amortization	$ (3,671)	$ (4,409)