SECURITIES (Schedule of Carrying Value, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2015	Sep. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Total securities held to maturity		$ 204,801	$ 201,526
Estimated Fair Value		209,835	202,315
Held to maturity securities unrealized gains before tax	$ 8,100	4,000	5,200
Obligations of States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Total securities held to maturity		204,801	201,526
Gross Unrealized Gains		5,111	1,617
Gross Unrealized (Losses)		(77)	(828)
Estimated Fair Value		$ 209,835	$ 202,315