DISCLOSURES ABOUT THE FAIR VALUE OF FINANCIAL INSTRUMENTS, Unobservable Input Reconciliation (Details) - Recurring [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of assets measured at fair value on recurring basis using significant unobservable inputs [Roll Forward]
Beginning balance	$ 2,985	$ 1,332
Purchases		2,000
Settlements	(356)	(345)
Unrealized losses included in other comprehensive income (loss)	(6)	(2)
Balance at end of period	2,623	2,985
Corporate Debt Securities [Member]
Reconciliation of assets measured at fair value on recurring basis using significant unobservable inputs [Roll Forward]
Beginning balance	982	1,329
Purchases		0
Settlements	(356)	(345)
Unrealized losses included in other comprehensive income (loss)	(6)	(2)
Balance at end of period	620	982
Common stocks Financial services [Member]
Reconciliation of assets measured at fair value on recurring basis using significant unobservable inputs [Roll Forward]
Beginning balance	3	3
Purchases		0
Settlements	0	0
Unrealized losses included in other comprehensive income (loss)	0	0
Balance at end of period	3	3
Nonredeemable Preferred Stock [Member]
Reconciliation of assets measured at fair value on recurring basis using significant unobservable inputs [Roll Forward]
Beginning balance	2,000	0
Purchases		2,000
Settlements	0	0
Unrealized losses included in other comprehensive income (loss)	0	0
Balance at end of period	$ 2,000	$ 2,000