FAIR VALUES OF FINANCIAL INSTRUMENTS (Reconciliation of All Assets Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3)) (Details) - State and Municipal Securities [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Balance of recurring Level 3 assets at January 1	$ 670	$ 551
Transfers into Level 3	325	339
Changes in fair value of securities included in other comprehensive income	(10)	(10)
Principal payments	(105)	(210)
Sales	0	0
Balance of recurring Level 3 assets at December 31	$ 880	$ 670