INCOME TAXES (Schedule of Income Tax Expense, Difference in Income Tax Rate to Pretax Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Computed expected tax expense	$ 36,489	$ 31,636	$ 24,601
Tax-exempt interest income, net	(6,087)	(5,865)	(5,181)
Other, net	(3,624)	(2,462)	(1,295)
Income tax expense	$ 26,778	$ 23,309	$ 18,125