ACCUMULATED OTHER COMPREHENSIVE INCOME, RECLASSIFICATION OF AOCI (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gain on sales of securities									$ (233)	$ (1,082)	$ (495)
Less provision for income taxes	$ (1,017)	$ (1,040)	$ (1,027)	$ (1,188)	$ (1,337)	$ (995)	$ (1,043)	$ (1,068)	(4,272)	(4,443)	$ (4,222)
Reclassification adjustment, net of taxes									152	712
Unrealized Gains and Losses on Available-for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment, net of taxes									152	712
Unrealized Gains and Losses on Available-for-Sale Securities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gain on sales of securities									233	1,082
Less provision for income taxes									81	370
Reclassification adjustment, net of taxes									$ 152	$ 712