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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Income tax expense (benefit) reconciliation [Abstract]          
United States federal corporate tax rate (in hundredths) 21.00% 21.00% 21.00% 21.00%  
Computed expected income tax expense (benefit) $ 345 $ (1,622) $ 9,225 $ (1,733)  
Incremental Benefit Of Net Operating Loss Carry Back 0 (839) 0 (839)  
Increases (decreases) in tax resulting from:          
Tax-exempt interest income (269) (297) (552) (607)  
Dividends received deduction (166) (151) (298) (274)  
Proration of tax-exempt interest and dividends received deduction 108 112 212 220  
Nondeductible expenses 374 30 419 55  
Internal Revenue Code 50(d)(5) income from investment tax credits (111) (36) 110 0  
Other, net 75 76 (6) (1)  
Total income tax expense (benefit) 356 $ (2,727) 9,110 $ (3,179)  
Provision for uncertain tax positions $ 0   $ 0   $ 0