FAIR VALUES OF FINANCIAL INSTRUMENTS (Quantitative Information about Level 3 Fair Value Measurements) (Details) - State and Municipal Securities [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets	$ 880	$ 670
Valuation Technique	Price to type, par, call	Price to type, par, call
Discount To Benchmark Index [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of Inputs (Average) (in hundredths)	0.00%	0.00%
Discount To Benchmark Index [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of Inputs (Average) (in hundredths)	5.00%	5.00%
Discount To Benchmark Index [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of Inputs (Average) (in hundredths)	2.03%	2.98%