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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
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 $ 1,767 $ 5,573 $ 11,904 $ 20,207  
Increases (decreases) in tax resulting from:          
Tax-exempt interest income (709) (687) (2,101) (2,072)  
Dividends received deduction (336) (266) (1,110) (809)  
Proration of tax-exempt interest and dividends received deduction 157 143 482 432  
Other, net 39 (31) (75) (292)  
Total income tax expense 918 $ 4,732 9,100 $ 17,466  
Provision for uncertain tax positions $ 0   $ 0   $ 0