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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in Accumulated Other Comprehensive Income or Loss by Component (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Beginning balances				$ 149,813	$ 143,748
Cumulative effect of account change	[1]					$ (162)
Balances at January 1, 2018, as adjusted						149,651
Total other comprehensive income (loss)		$ (1,166)	$ (303)	(4,745)	3,479
Ending balances		156,499	154,277	156,499	154,277
Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Beginning balances		(14,121)	(6,972)	(10,340)	(10,754)
Cumulative effect of account change	[1]					(202)
Balances at January 1, 2018, as adjusted						(10,542)
Other comprehensive income before reclassification		(1,179)	(324)		3,425
Amounts reclassified from accumulated other comprehensive income		13	21		54
Total other comprehensive income (loss)		(1,166)	(303)	(4,745)	3,479
Ending balances		(15,287)	(7,275)	(15,287)	(7,275)
Accumulated Net Investment Gain (Loss) Attributable to Parent
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Beginning balances		(7,223)	(615)	(3,415)	(4,356)
Cumulative effect of account change						(202)
Balances at January 1, 2018, as adjusted						(3,617)
Other comprehensive income before reclassification		(1,179)	(324)	(4,785)	3,425
Amounts reclassified from accumulated other comprehensive income		0	0	0	(8)
Total other comprehensive income (loss)		(1,179)	(324)	(4,785)	3,417
Ending balances		(8,402)	(939)	(8,402)	(939)
Defined Benefit and Other Benefit Plans
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Beginning balances		(6,898)	(6,357)	(6,925)	(6,398)
Cumulative effect of account change						0
Balances at January 1, 2018, as adjusted						$ (6,925)
Other comprehensive income before reclassification		0	0	0	0
Amounts reclassified from accumulated other comprehensive income		13	21	40	62
Total other comprehensive income (loss)		13	21	40	62
Ending balances		$ (6,885)	$ (6,336)	$ (6,885)	$ (6,336)
[1] Due to implementation of ASC 2016-01. See "Adoption of New Accounting Standards" discussion in Note 1.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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