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Investments - Summary of Investments (Detail) - Municipal Securities [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 89,631	$ 62,769
Gross Unrealized Gains	57	12
Gross Unrealized (Losses)	(79)	(185)
Estimated Fair Value	$ 89,609	$ 62,596

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB
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-Topic 320
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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