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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
OCI, Pre-tax:
Pre-tax, Other comprehensive income (loss)			$ 203	$ (3,888)
Pre-tax, Reclassification adjustments to retained earnings					$ 5,830
Pre-tax, Change in accumulated other comprehensive income (loss)		$ (478)
OCI, Tax:
Tax, Other comprehensive income (loss)			76	(1,486)
Tax, Reclassification adjustments to retained earnings					2,811
Tax, Change in accumulated other comprehensive income (loss)		1,251
After-tax:
Other comprehensive income (loss)	[1]	(4,748)	127	(2,402)
After-tax, Reclassification adjustments to retained earnings					$ 3,019
After-tax, Change in accumulated other comprehensive income (loss)		(1,729)
Net changes related to available-for-sale securities:
OCI, Pre-tax:
Pre-tax, Unrealized holding gains (losses) arising during the period		(9,111)	2,773	(1,594)
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income		2,803	(2,570)	(2,294)
Pre-tax, Other comprehensive income (loss)		(6,308)	203	(3,888)
OCI, Tax:
Tax, Unrealized holding gains (losses) arising during the period		(2,254)	1,058	(609)
Tax, Less: Reclassification adjustments (gains) losses realized in net income		694	(982)	(877)
Tax, Other comprehensive income (loss)		(1,560)	76	(1,486)
After-tax:
After-tax, Unrealized holding gains (losses) arising during the period		(6,857)	1,715	(985)
After-tax, Less: Reclassification adjustments (gains) losses realized in net income		2,109	(1,588)	(1,417)
Other comprehensive income (loss)		$ (4,748)	$ 127	$ (2,402)
[1] Represents change in fair value of available-for-sale investments, net of income tax provision of $76 thousand for the year ended December 31, 2017 and a change in fair value of available-for-sale investments, net of income tax benefit of $1,560 thousand and $1,486 thousand for the years ended December 31, 2018 and 2016, respectively.

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