INCOME TAXES (Schedule of Income Tax Expense, Difference in Income Tax Rate to Pretax Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Net [Abstract]
Computed expected tax expense	$ 39,122	$ 48,564	$ 37,680
Tax-exempt interest income, net	(8,844)	(8,259)	(5,188)
State income tax benefit	(310)	(1,078)	(1,133)
Other, net	(1,902)	(1,670)	(1,343)
Income tax expense	$ 28,066	$ 37,557	$ 30,016