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, 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