DISCLOSURES ABOUT THE FAIR VALUE OF FINANCIAL INSTRUMENTS, Unobservable Input Reconciliation (Details) - Recurring [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of assets measured at fair value on recurring basis using significant unobservable inputs [Roll Forward]
Beginning balance	$ 623	$ 2,985
Settlements	(56)	(50)
Unrealized losses included in other comprehensive income (loss)	(2)	(3)
Balance at end of period	565	2,932
Corporate Debt Securities [Member]
Reconciliation of assets measured at fair value on recurring basis using significant unobservable inputs [Roll Forward]
Beginning balance	620	982
Settlements	(56)	(50)
Unrealized losses included in other comprehensive income (loss)	(2)	(3)
Balance at end of period	562	929
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
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
Settlements		0
Unrealized losses included in other comprehensive income (loss)		0
Balance at end of period		$ 2,000