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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income tax expense (benefit) reconciliation [Abstract]          
United States federal corporate tax rate (in hundredths) 21.00% 35.00% 21.00% 35.00%  
Computed expected income tax expense (benefit) $ (1,622) $ 2,530 $ (1,733) $ 5,484  
Increases (decreases) in tax resulting from:          
Incremental benefit of net operating loss carry back (839) 0 (839) 0  
Tax-exempt interest income (297) (761) (607) (1,466)  
Dividends received deduction (151) (348) (274) (654)  
Proration of tax-exempt interest and dividends received deduction 112 166 220 318  
Other, net 70 138 54 (321)  
Total income tax expense (benefit) (2,727) $ 1,725 (3,179) $ 3,361  
Provision for uncertain tax positions $ 0   $ 0   $ 0