FAIR VALUE MEASUREMENTS - LEVEL 3 ACTIVITIES (Details) - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Equity
Fair values of assets using Level 3 inputs, specifically discounted cash flow projections
Balance at the beginning	$ 500
Purchases		$ 500
Balance at the end	500	500
US Agencies - MBS
Fair values of assets using Level 3 inputs, specifically discounted cash flow projections
Balance at the beginning	1,150
Realized net gain (losses)	38
Purchases		1,150
Sales	(1,188)
Balance at the end		$ 1,150
Obligations of states and political subdivisions
Fair values of assets using Level 3 inputs, specifically discounted cash flow projections
Transfers in (out) of level 3	740
Purchases	260
Balance at the end	$ 1,000