Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Schedule of Income Tax Expense, Difference in Income Tax Rate to Pretax Income) (Details)

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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