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, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Computed expected tax expense $ 37,208 $ 36,489 $ 31,636
Tax-exempt interest income, net (6,112) (6,087) (5,865)
Valuation allowance adjustment (2,982) 0 0
Impact of the Tax Act 6,250 0 0
Other, net (977) (3,624) (2,462)
Income tax expense $ 33,387 $ 26,778 $ 23,309