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OTHER COMPREHENSIVE LOSS - Change in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (20,615)
Ending balance	$ (62,887)		(62,887)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Debt Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(52,107)	$ (14,625)	(20,609)	$ (34,383)
Other comprehensive (loss) income	(10,780)	3,719	(42,278)	11,617
Amounts reclassified from accumulated comprehensive loss	0	0	0	11,860
Ending balance	(62,887)	(10,906)	(62,887)	(10,906)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Equity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	0	(4)	(6)	(7)
Other comprehensive (loss) income	0	0	0	3
Amounts reclassified from accumulated comprehensive loss	0	0	6	0
Ending balance	$ 0	$ (4)	$ 0	$ (4)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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

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