FEDERAL INCOME TAX (Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation Of Consolidated Federal Income Tax Expense (Benefit) [Line Items]
Consolidated federal income tax expense (benefit)	$ 2,059	$ (11,405)	$ (29,220)
Consolidated federal income tax expense (benefit), gain on sale of discontinued operations		7,544	0
Consolidated federal income tax expense (benefit), discontinued operations	0	563	4,490
Continuing and Discontinuing Operations
Reconciliation Of Consolidated Federal Income Tax Expense (Benefit) [Line Items]
Computed expected income tax expense	3,544	5,114	9,202
Impact of enactment of Tax Act	0	0	(21,884)
Tax-exempt municipal bond interest income	(3,961)	(4,235)	(8,875)
Nontaxable dividend income	(594)	(591)	(1,540)
Valuation allowance reduction	0	(329)	(547)
Compensation	1,638	(497)	(695)
Reinsurance	998	0	0
Other, net	434	(2,760)	(391)
Consolidated federal income tax expense (benefit)	$ 2,059	$ (3,298)	$ (24,730)