SHAREHOLDERS' EQUITY (Reconciliation of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Before Tax
Cumulative effect of new accounting standards			$ (1,349)	$ 0
Income Tax
Cumulative effect of new accounting standards			355	0
Net
Accumulated other comprehensive income (loss), beginning-of-period			1,770
Cumulative effect of new accounting standards			(994)	0
Accumulated other comprehensive income (loss), end-of-period	$ (5,901)		(5,901)
AOCI Attributable to Parent
Before Tax
Accumulated other comprehensive income (loss), beginning-of-period	(7,166)	$ 8,248	2,287	3,324
Other comprehensive income (loss) before reclassification	(575)	2,013	(10,573)	9,480
Reclassification adjustment for realized losses (gains) included in net income	(162)	(6,101)	1,732	(8,644)
Comprehensive income (loss)	(737)	(4,088)	(8,841)	836
Accumulated other comprehensive income (loss), end-of-period	(7,903)	4,160	(7,903)	4,160
Income Tax
Accumulated other comprehensive income (loss), beginning-of-period	1,816	(3,166)	(593)	(1,201)
Other comprehensive income (loss) before reclassification	145	(710)	2,679	(3,656)
Reclassification adjustment for realized losses (gains) included in net income	41	2,353	(439)	3,334
Other Comprehensive Income (Loss), Tax	186	1,643	2,240	(322)
Accumulated other comprehensive income (loss), end-of-period	2,002	(1,523)	2,002	(1,523)
Net
Accumulated other comprehensive income (loss), beginning-of-period	(5,350)	5,082	1,694	2,123
Other comprehensive income (loss) before reclassification	(430)	1,303	(7,894)	5,824
Reclassification adjustment for realized losses (gains) included in net income	(121)	(3,748)	1,293	(5,310)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(551)	(2,445)	(6,601)	514
Accumulated other comprehensive income (loss), end-of-period	$ (5,901)	$ 2,637	$ (5,901)	$ 2,637