INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income tax expense (benefit) reconciliation [Abstract]
United States federal corporate tax rate (in hundredths)	21.00%	35.00%
Computed expected income tax expense (benefit)	$ (111)	$ 2,954
Increases (decreases) in tax resulting from:
Tax-exempt interest income	(310)	(705)
Dividends received deduction	(123)	(306)
Proration of tax-exempt interest and dividends received deduction	108	152
Other, net	(16)	(459)
Total income tax expense (benefit)	(452)	$ 1,636
Provision for uncertain tax positions	$ 0		$ 0