INCOME TAXES (Schedule of Income Tax Expense, Difference in Income Tax Rate to Pretax Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Computed expected tax expense	$ 37,680	$ 36,738	$ 35,645
Tax-exempt interest income, net	(5,188)	(6,112)	(6,087)
Valuation allowance adjustment	0	(2,982)	0
Impact of the Tax Act	0	6,105	0
Other, net	(2,476)	(959)	(3,614)
Income tax expense	$ 30,016	$ 32,790	$ 25,944