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Fair Value Measurements - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Maturing in one year or less	$ 1,412	$ 916
Maturing in second year through fifth year	19,067	15,948
Maturing in sixth year through tenth year	18,737	22,851
Maturing after ten years	35,712	33,506
Total debt securities	$ 74,928	$ 73,221

X

- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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