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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
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 $ 2,530 $ 2,830 $ 5,484 $ 10,137  
Increases (decreases) in tax resulting from:          
Tax-exempt interest income (761) (697) (1,466) (1,392)  
Dividends received deduction (348) (349) (654) (774)  
Proration of tax-exempt interest and dividends received deduction 166 157 318 325  
Other, net 138 18 (321) (114)  
Total income tax expense 1,725 $ 1,959 3,361 $ 8,182  
Provision for uncertain tax positions $ 0   $ 0   $ 0