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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Income tax expense (benefit) reconciliation [Abstract]          
United States federal corporate tax rate (in hundredths) 35.00% 35.00% 35.00% 35.00%  
Computed expected income tax expense $ 5,573 $ 659 $ 20,207 $ 5,965  
Increases (decreases) in tax resulting from:          
Tax-exempt interest income (687) (757) (2,072) (2,559)  
Dividends received deduction (266) (247) (809) (725)  
Proration of tax-exempt interest and dividends received deduction 143 151 432 493  
Other, net (31) (152) (292) 30  
Total income tax expense (benefit) 4,732 $ (346) 17,466 $ 3,204  
Provision for uncertain tax positions $ 0   $ 0   $ 0