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Fair Value Measurements - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Maturing in one year or less	$ 2,927	$ 876
Maturing in second year through fifth year	26,324	16,071
Maturing in sixth year through tenth year	55,366	38,801
Maturing after ten years	40,395	34,963
Total debt securities	$ 125,012	$ 90,711	$ 76,362

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- 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 current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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