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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Income tax expense (benefit) reconciliation [Abstract]      
United States federal corporate tax rate (in hundredths) 35.00% 35.00%  
Computed expected income tax expense $ 7,307 $ 10,478  
Increases (decreases) in tax resulting from:      
Tax-exempt interest income (695) (698)  
Dividends received deduction (425) (258)  
Proration of tax-exempt interest and dividends received deduction 168 143  
Other, net (132) (58)  
Total income tax expense 6,223 $ 9,607  
Provision for uncertain tax positions $ 0   $ 0