SECURITIES (Schedule of Carrying Value, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Jun. 30, 2015	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Total securities held to maturity	$ 203,478		$ 201,526
Estimated Fair Value	205,611		202,315
Held to maturity securities unrealized gains before tax	4,800	$ 8,100	5,200
Obligations of States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Total securities held to maturity	203,478		201,526
Gross Unrealized Gains	2,409		1,617
Gross Unrealized (Losses)	(276)		(828)
Estimated Fair Value	$ 205,611		$ 202,315