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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income tax expense (benefit) reconciliation [Abstract]      
United States federal corporate tax rate (in hundredths) 21.00% 21.00%  
Computed expected income tax expense (benefit) $ 8,880 $ (111)  
Increases (decreases) in tax resulting from:      
Tax-exempt interest income (283) (310)  
Dividends received deduction (132) (123)  
Proration of tax-exempt interest and dividends received deduction 104 108  
Investment tax credits (Internal Revenue Code 50(d)(5) income) 221 36  
Other, net (36) (52)  
Total income tax expense (benefit) 8,754 $ (452)  
Provision for uncertain tax positions $ 0   $ 0